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  • This is a Pteromys volans orii flying squirrel gliding through the forest early one winter morning.
    pteromys-volans-orii-flying-squirrel...tif
  • This Pteromys volans orii flying squirrel has carried a few sticks of Japanese elm (Ulmus davidiana var. japonica) back to its nest at the end of foraging to enjoy a takeaway meal before going inside.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel gliding through the forest in the early morning.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel peeking out from the entrance to its nest just before a major snowstorm hit. The northwest side of the tree was already coated with snow, and the winds had picked up considerably. The squirrel decided not to emerge at the time.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a female Pteromys volans orii flying squirrel sitting at the entrance to her nest.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a female Pteromys volans orii flying squirrel feasting on a branch that she cut from a nearby Sakhalin fir tree (Abies sachalinensis).
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel consuming male catkins from an Erman's birch tree (Betula ermanii).
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel enjoying an early morning scratch.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel making its final approach back to the nest after foraging. The animal blends in perfectly with its environment, a snow-covered forest. The entrance to the nest is a narrow crack in the Erman's birch (Betula ermanii) tree.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel gliding through the forest.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel sitting in a favorite spot during an overcast winter morning.
    pteromys-volans-orii-flying-squirrel...tif
  • Pteromys volans flying squirrels often peek out from their nests prior to exiting. This behavior might serve to minimize risk of predation, as well as to allow the animal's eyes to acclimate to ambient light levels. Narrow apertures like this one provide protection from predators.
    pteromys-volans-orii-flying-squirrel...tif
  • This is an unusual behavior. This Pteromys volans orii flying squirrel had stashed food in an unused bird's nest at some point. On this overcast day, the squirrel plucked out and consumed male catkins of an Erman's birch (Betula ermanii), one after another, until the food stash was exhausted.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a male Pteromys volans orii flying squirrel that has emerged from its nest during daylight hours. It was defending a female in estrus from the approach of another male.
    pteromys-volans-orii-flying-squirrel...tif
  • While I was photographing a pair of Pteromys volans orii flying squirrels perched on a branch about 10m directly overhead, the male took aim and peed on me. Fortunately I have quick reactions.
    pteromys-volans-orii-flying-squirrel...tif
  • This is an Ezo chipmunk (Tamias sibiricus lineatus) grooming itself by licking its paws and rubbing its face and body.
    tamias-sibiricus-lineatus-ezo-chipmu...tif
  • This is an Ezo chipmunk (Tamias sibiricus lineatus), recently emerged from winter hibernation.
    tamias-sibiricus-lineatus-ezo-chipmu...tif
  • This Ezo chipmunk (Tamias sibiricus lineatus) has just emerged from hibernation, during which time it lost substantial body mass, as well as the hair on its tail. These squirrels eat much of what they find, then stuff their mouths full as shown here in order to store food in the nests.
    tamias-sibiricus-lineatus-ezo-chipmu...tif
  • This is a Pteromys volans orii flying squirrel bathed in the cool light of an early winter morning. These animals are normally nocturnal.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel male pausing after grooming himself during an early winter morning. This male shared the nest with a female, which joined him shortly after this photo was taken. The pair mated 10 days after this photo was taken.
    japanese-flying-squirrel-pteromys-vo...tif
  • This is a Pteromys volans orii flying squirrel male grooming itself after emerging from his nest on an early winter morning. This male shared the nest with a female. The pair mated 10 days after this photo was taken.
    japanese-flying-squirrel-pteromys-vo...tif
  • This is a Pteromys volans orii flying squirrel male grooming itself after emerging from his nest on an early winter morning. This male shared the nest with a female. The pair mated 10 days after this photo was taken.
    japanese-flying-squirrel-pteromys-vo...tif
  • Pictured here are two male Pteromys volans orii flying squirrels. The one inside the tree has just peeked out from the nest which he has occupied with a female that has gone into estrus. Caught sneaking up to try to enter the nest to compete for the female, the male on the tree has just jumped away to avoid a confrontation.
    japanese-flying-squirrel-pteromys-vo...tif
  • This is a Japanese dwarf flying squirrel (Pteromys volans orii) flying through the forest on a cold winter day. Usually nocturnal, these animals sometimes become active in the day during reproductive season.
    japanese-flying-squirrel-pteromys-vo...tif
  • This is a Pteromys volans orii Japanese dwarf flying squirrel gliding across the top of the tree canopy after sunset. The moon is visible, six days prior to being full. This individual was part of a ruckus of reproductive season activity stretching over many hours that involved two females and three males.
    japanese-flying-squirrel-pteromys-vo...tif
  • Competition between rival males for the right to mate with a female flying squirrel (Pteromys volans orii) in estrus can become heated. The two males pictured here chased one another up and down the tree, culminating in one executing a full body-slam punch, sending the other into the air.
    japanese-flying-squirrel-pteromys-vo...tif
  • This is a male Japanese dwarf flying squirrel (Pteromys volans orii). This sub-species of Siberian flying squirrel, found only in Hokkaido, Japan and known locally as ezo-momonga, is primarily nocturnal. This imdividual was active during the day because it was competing for the attention of a female in oestrous. The squirrel paused for a moment to groom himself.
    japanese-dwarf-flying-squirrel-male-...tif
  • This is a male Japanese dwarf flying squirrel (Pteromys volans orii) sitting on a branch. This sub-species of Siberian flying squirrel, found only in Hokkaido, Japan and known locally as ezo-momonga, is primarily nocturnal. This imdividual was active during the day because it was competing for the attention of a female in oestrous.
    japanese-dwarf-flying-squirrel-male-...tif
  • This is the moment that one male Japanese dwarf flying squirrel (Pteromys volans orii) ambushed a rival male, sneaking up from behind and leaping on on top of the other male. Male rivalry and competition like this takes place during the reproductive season. The action is rapid, often spanning wide areas as the animals leap and glide among trees.
    japanese-dwarf-flying-squirrel-males...tif
  • This is a Japanese dwarf flying squirrel (Pteromys volans orii), a sub-species of Siberian flying squirrel. Known locally as ezo-momonga, this sub-species is found only in Hokkaido, Japan. It is primarily nocturnal. This indiividual has just emerged from its nest at dusk, and is taking a moment before heading out for a night of foraging. From this perspective, it is possible to see how the squirrel grasps and maintains a grip on delicate branches. Mature females measure up to 15cm, males up to 18cm (not including tail). These animals weigh up to 120g and are capable of gliding considerable distances. During flight, they use their patagia (membranes of skin between their forelimbs and hind limbs) and tails (10-12cm) to achieve lift, directional control and maneuvering capability. One study in Japan recorded a maximum glide distance exceeding 49m, though most flights fell into the 10m to 20m range.
    japanese-dwarf-flying-squirrel-at-du...tif
  • This is a Japanese dwarf flying squirrel (Pteromys volans orii), gliding from the top of one tree to another. Known locally as ezo-momonga, this sub-species of Siberian flying squirrel is found only in Hokkaido, Japan. Mature females measure up to 15cm, males up to 18cm (not including tail). These animals weigh up to 120g and are capable of gliding considerable distances. During flight, they use their patagia (membranes of skin between their forelimbs and hind limbs) and tails (10-12cm) to achieve lift, directional control and maneuvering capability. One study in Japan recorded a maximum glide distance exceeding 49m, though most flights fell into the 10m to 20m range. Although these animals are primarily nocturnal, they sometimes emerge during the day. Usually this is for brief durations to urinate or defecate. In this instance, this particular individual was one of two males competing for the right to mate with a female. Such reproduction-related competition sometimes takes place during daylight hours.
    japanese-dwarf-flying-squirrel-airbo...tif
  • This is an Ezo red fox (Vulpes vulpes schrencki), called Kita Kitsune in Japanese, carrying a vole (Myodes sp.) that it caught in an area of exposed grass. At the time of this photo, the snow had just begun to melt, creating a patchwork of exposed terrain.
    vulpes-vulpes-schrencki-ezo-red-fox-...tif
  • Portrait of the Japanese subspecies of Eurasian Red Squirrel (Sciurus vulgaris orientis)
    sciurus-vulgaris-orientis-red-squirr...tif
  • This is a male Pteromys volans orii flying squirrel sitting in a favorite spot on a sunny day, looking down upon his surroundings.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel flying through trees.
    pteromys-volans-orii-flying-squirrel...tif
  • This Pteromys volans orii flying squirrel has just started to consume male catkins from an Erman's birch tree (Betula ermanii).
    pteromys-volans-orii-flying-squirrel...tif
  • This Pteromys volans orii flying squirrel is enjoying a meal of male catkins from an Erman's birch tree (Betula ermanii).
    pteromys-volans-orii-flying-squirrel...tif
  • The pair of Pteromys volans orii flying squirrels in the center of the photo comprise a male (left, facing camera) and female (right). The female is in estrus. At this point, the pair had copulated several times, but also attracted the attention of rival males, like the one above, which was poised to pounce in an attempt to dislodge the primary male.
    pteromys-volans-orii-flying-squirrel...tif
  • This is an Ezo chipmunk (Tamias sibiricus lineatus) grooming itself by licking its paws and rubbing its face and body.
    tamias-sibiricus-lineatus-ezo-chipmu...tif
  • This Japanese flying squirrel (Pteromys volans orii) is perched on a comfortable, safe location high above the ground, where it is eating one of its favorite foods, the buds of a Japanese elm tree (Ulmus davidiana var. japonica). Normally nocturnal, these squirrels are sometimes active in the early hours of daylight.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel emerging from a hideaway at the base of a tall tree. This individual was just digging its way out after snowfall had accumulated and blocked the entrance.
    pteromys-volans-orii-flying-squirrel...tif
  • The frustrating moment when a Pteromys orii volans flying squirrel passed directly over my head from behind. I spun around and pressed the shutter on instinct from waist height as the squirrel flew past mere centimeters above my head.
    pteromys-volans-orii-flying-squirrel...tif
  • When female Pteromys volans orii squirrels go into estrus, there is usually a primary male with her. He fends off challengers and does his best to monopolize copulation opportunities. Females will mate with other males when the opportunity arises however. Here, the female has snuck out to copulate with another male. The primary male has just realized what is happening and has rushed out of the den to confront the interloper.
    pteromys-volans-orii-flying-squirrel...tif
  • Depicted here is a pair of Pteromys volans orii flying squirrels sharing a nest high up in the canopy. The larger individual on the left is female, the other male. During the peak of reproductive season, males and females often pair up like this. The bonds are not permanent though, and fidelity is not certain. It is not unusual for females to mate with more than one male.
    pteromys-volans-orii-pair-japan-2021...tif
  • This male and female Pteromys volans orii flying squirrels have paired up for the reproductive season. They had just finished foraging for food high in the canopy and were sitting together like this during light snow. The pair mated a few days after this photograph was taken. The male is on the right, female left.
    japanese-flying-squirrel-pteromys-vo...tif
  • This is a pair of Japanese dwarf flying squirrels (Pteromys volans orii) engaged in copulation. The crack in the middle of the tree is the entrance to their nest.
    japanese-dwarf-flying-squirrel-copul...tif
  • This is a Japanese dwarf flying squirrel (Pteromys volans orii) shaking itself off at the entrance of its nest.
    japanese-dwarf-flying-squirrel-20200...tif
  • This is a male Japanese dwarf flying squirrel (Pteromys volans orii). This sub-species of Siberian flying squirrel, found only in Hokkaido, Japan and known locally as ezo-momonga, is primarily nocturnal. This imdividual was active during the day because it was competing for the attention of a female in oestrous.
    japanese-dwarf-flying-squirrel-male-...tif
  • This is a female Pteromys volans orii flying squirrel that has brought back a few small branches of an Erman's birch tree (Betula ermanii) to her nest as a takeaway meal.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel scratching his face on a branch while grooming himself early in the morning.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel pausing in a favored spot after emerging from its nest, just prior to ascending to the treetops to forage. There is snow in the background. The soft, cool light is from the setting sun.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel looking down from a tree at sunset.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel consuming snow for moisture. This behavior seems to take place most often after foraging.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel consuming snow for moisture after an extended period of foraging.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel en route back to its nest after foraging at the top of 20m+ tall Japanese elm trees (Ulmus davidiana var. japonica) for an extended period of time during snowfall. The squirrel is carrying a branch with fresh elm buds back to its nest—a takeaway meal to relish at home.
    pteromys-volans-orii-flying-squirrel...tif
  • Just before a Pteromys volans orii flying squirrel lands on a tree, the animals folds its wings inward and stretches its limbs toward the targeted tree. This serves to slow the animal's approach and also to prepare the animal to be able to move immediately upon landing.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel gliding through the forest canopy during light snow in winter.
    pteromys-volans-orii-flying-squirrel...tif
  • Pteromys volans orii flying squirrels are usually nocturnal. This one was active during the day, as shown here. Diurnal activity like this is not common. This unusual behavior may have been an adaptation to the presence of a pair of Ural owls.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel gliding through the forest canopy during light snowfall.
    pteromys-volans-orii-flying-squirrel...tif
  • This is an unusual behavior. This Pteromys volans orii flying squirrel had stashed food in an unused bird's nest at some point. On this overcast day, the squirrel plucked out and consumed male catkins of an Erman's birch (Betula ermanii), one after another, until the food stash was exhausted.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel carrying a small branch of Japanese elm (Ulmus davidiana var. japonica) back to its nest. This individual had spent over an hour in the early morning at the top of 20m tall elm trees feasting on fresh buds. This branch is a take-away meal for enjoyment back home.
    pteromys-volans-orii-flying-squirrel...tif
  • This is an Ezo red squirrel (Sciurus vulgaris orientis) gathering materials for its nest in preparation for reproductive season.
    sciurus-vulgaris-orientis-ezo-red-sq...tif
  • This is an Ezo chipmunk (Tamias sibiricus lineatus) pausing for a moment while foraging. This animal had only just recently emerged from hibernation.
    tamias-sibiricus-lineatus-ezo-chipmu...tif
  • This is an Ezo chipmunk (Tamias sibiricus lineatus) that has just emerged from hibernation days before this photo was taken. This ground squirrel has lost substantial body mass, as well as the hair on its tail, during the winter.
    tamias-sibiricus-lineatus-ezo-chipmu...tif
  • This is an Ezo chipmunk (Tamias sibiricus lineatus) that has just emerged from hibernation days before this photo was taken. This ground squirrel has lost substantial body mass, as well as the hair on its tail, during the winter.
    tamias-sibiricus-lineatus-ezo-chipmu...tif
  • This is a male Pteromys volans orii flying squirrel standing guard at the entrance of a nest. Inside is a female that has entered estrus. This has attracted the attention of another male, which means that this male must maintain continual vigil. The two males faced off a number of times. Interlopers are sometimes successful in mating with females while the primary male is unaware or otherwise occupied.
    pteromys-volans-orii-flying-squirrel...tif
  • Pteromys volans orii flying squirrels engaged in copulation during daylight hours
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel urinating, having braced itself at the entrance of its nest for the purpose. A stream of urine is visible flowing down the darkened trench beneath the pile of defecation. In most cases, these squirrels relieve themselves someplace removed from their nests. This behavior is unusual.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a female Pteromys volans orii flying squirrel emerging from her nest in the early evening prior to departing for a night of foraging. These animals often pause like this before commencing nocturnal activity.
    pteromys-volans-orii-flying-squirrel...tif
  • During the reproductive season, competition among male Pteromys volans orii flying squirrels sometimes gets heated. Bites, snips and other physical contact happens. This male has found a quiet place to recover from a confrontation with a rival. The animal's bloodied left foot is just visible, the result of a protracted high-speed squabble.
    pteromys-volans-orii-male-injured-fo...tif
  • This is a Pteromys volans orii flying squirrel male grooming itself after emerging from his nest on an early winter morning. This male shared the nest with a female. The pair mated 10 days after this photo was taken.
    japanese-flying-squirrel-pteromys-vo...tif
  • This is a portrait of a Pteromys volans orii flying squirrel male illuminated by the light of an early winter morning. He had just emerged from his nest, followed shortly thereafter by a female. The pair mated 10 days after this photo was taken.
    japanese-flying-squirrel-pteromys-vo...tif
  • This is a Pteromys volans orii Japanese dwarf flying squirrel male perched at the top entrance to a nest. On this day, he was guarding a female inside the nest. She was in estrus, and the male was warding off other males. This pair mated several times throughout the day, but the female also mated with another male while this one was unaware. This photo is third in a series of three which illustrate the height of the nest.
    japanese-flying-squirrel-pteromys-vo...tif
  • This is a male Pteromys volans orii flying squirrel gliding through the canopy in mid-afternoon. This species is primarily nocturnal. During the peak of the reproductive season, they can become active during the day when there is competition among males for a female in estrus, as was the case here.
    japanese-flying-squirrel-pteromys-vo...tif
  • This is a male Japanese dwarf flying squirrel (Pteromys volans orii). This sub-species of Siberian flying squirrel, found only in Hokkaido, Japan and known locally as ezo-momonga, is primarily nocturnal. This imdividual was active during the day because it was competing for the attention of a female in oestrous. The squirrel took a moment here to scratch his back.
    japanese-dwarf-flying-squirrel-male-...tif
  • This is a Japanese dwarf flying squirrel (Pteromys volans orii) that has just emerged from its nest at dusk to set out for a night of foraging.
    japanese-dwarf-flying-squirrel-20200...tif
  • This Japanese dwarf flying squirrel (Pteromys volans orii) snacking on a Japanese alder (Alnus japonica) flower, one of this species’ preferred foods.
    japanese-dwarf-flying-squirrel-20200...tif
  • This is a male Japanese dwarf flying squirrel (Pteromys volans orii). This sub-species of Siberian flying squirrel, found only in Hokkaido, Japan and known locally as ezo-momonga, is primarily nocturnal. This imdividual was active during the day because it was competing for the attention of a female in oestrous.
    japanese-dwarf-flying-squirrel-20200...tif
  • This is a pair of Japanese dwarf flying squirrels (Pteromys volans orii) engaged in copulation. This is an extended process spanning many hours, during which the male often needs to fend off rivals while engaging in repeated bouts of copulation.
    japanese-dwarf-flying-squirrels-mati...tif
  • This is a pair of Japanese dwarf flying squirrels (Pteromys volans orii) engaged in copulation. This is an extended process spanning many hours, during which the male often needs to fend off rivals while engaging in repeated bouts of copulation. As shown here, the female can, and often does, put up some measure of resistance, occasionally dislodging the male completely. The male’s penis is visible.
    japanese-dwarf-flying-squirrels-mati...tif
  • This is a male Japanese dwarf flying squirrel (Pteromys volans orii), looking out from his nest. This sub-species of Siberian flying squirrel, found only in Hokkaido, Japan and known locally as ezo-momonga, is primarily nocturnal. This male was active during the day because it was competing for the attention of a female in oestrous.
    japanese-dwarf-flying-squirrel-male-...tif
  • This is a Japanese dwarf flying squirrel (Pteromys volans orii), a sub-species of Siberian flying squirrel, emerging from its nest at dusk to set out for a night of foraging. Known locally as ezo-momonga, this sub-species is found only in Hokkaido, Japan. It is primarily nocturnal. Mature females measure up to 15cm, males up to 18cm (not including tail). These animals weigh up to 120g and are capable of gliding considerable distances. During flight, they use their patagia (membranes of skin between their forelimbs and hind limbs) and tails (10-12cm) to achieve lift, directional control and maneuvering capability. One study in Japan recorded a maximum glide distance exceeding 49m, though most flights fell into the 10m to 20m range.
    japanese-dwarf-flying-squirrel-at-du...tif
  • This is a Japanese dwarf flying squirrel (Pteromys volans orii), a sub-species of Siberian flying squirrel. getting ready to leave its nest to set out for a night of foraging. Known locally as ezo-momonga, this sub-species is found only in Hokkaido, Japan. It is primarily nocturnal. Mature females measure up to 15cm, males up to 18cm (not including tail). These animals weigh up to 120g and are capable of gliding considerable distances. During flight, they use their patagia (membranes of skin between their forelimbs and hind limbs) and tails (10-12cm) to achieve lift, directional control and maneuvering capability. One study in Japan recorded a maximum glide distance exceeding 49m, though most flights fell into the 10m to 20m range.
    japanese-dwarf-flying-squirrel-at-du...tif
  • This is a Japanese dwarf flying squirrel (Pteromys volans orii), a sub-species of Siberian flying squirrel. Known locally as ezo-momonga, this sub-species is found only in Hokkaido, Japan. It is primarily nocturnal. Mature females measure up to 15cm, males up to 18cm (not including tail). These animals weigh up to 120g and are capable of gliding considerable distances. During flight, they use their patagia (membranes of skin between their forelimbs and hind limbs) and tails (10-12cm) to achieve lift, directional control and maneuvering capability. One study in Japan recorded a maximum glide distance exceeding 49m, though most flights fell into the 10m to 20m range. This individual has just emerged shortly after sunset from its nest, a cavity in the tree pictured. After preening for a bit, the flying squirrel ascended into the canopy to forage for the night. While these squirrels are known to nest in a number of tree species, they appear to prefer Sakhalin fir trees (Abies sachalinensis).
    japanese-dwarf-flying-squirrel-ptero...tif
  • This is the Japanese subspecies of Eurasian Red Squirrel (Sciurus vulgaris orientis) pausing with a nut it retrieved from the ground, perhaps one that it had buried.
    sciurus-vulgaris-orientis-red-squirr...tif
  • This is a species of flying squirrel called Ezo Momonga in Japanese (Pteromys volans orii). It is a sub-species of Siberian flying squirrels that is found on the island of Hokkaido in Japan. These squirrels are primarily nocturnal and usually shy, though the squirrels can occasionally be seen during the day. They prefer to take up residence in holes made by woodpeckers. This individual has just emerged from its hole in a Sakhalin fir tree  (Abies sachalinensis) at dusk, preparing for a night of foraging. Their diet primarily comprises leaves, seeds, cones, buds, sprouts, nuts and berries. This species does not hibernate.
    ezo-momonga-pteromys-volans-orii-fly...tif
  • This is a species of flying squirrel called Ezo Momonga in Japanese (Pteromys volans orii). It is a sub-species of Siberian flying squirrels that is found on the island of Hokkaido in Japan. These squirrels are primarily nocturnal and usually shy, though the squirrels can occasionally be seen during the day. They prefer to take up residence in holes made by woodpeckers. Their diet primarily comprises leaves, seeds, cones, buds, sprouts, nuts and berries. This individual paused in this position for a few moments after emerging one winter evening from its hole in a Sakhalin fir tree (Abies sachalinensis), known as todomatsu in Japanese. This species does not hibernate.
    ezo-momonga-pteromys-volans-orii-fly...tif
  • This is a species of flying squirrel called Ezo Momonga in Japanese (Pteromys volans orii). It is a sub-species of Siberian flying squirrels that is found on the island of Hokkaido in Japan. These squirrels are primarily nocturnal and usually shy, though the squirrels can occasionally be seen during the day. They prefer to take up residence in holes made by woodpeckers. Their diet primarily comprises leaves, seeds, cones, buds, sprouts, nuts and berries. This individual is nibbling on the soft parts of a Sakhalin fir tree (Abies sachalinensis), known as todomatsu in Japanese. This species does not hibernate.
    ezo-momonga-pteromys-volans-orii-fly...tif
  • This is a Pteromys volans orii flying squirrel gliding through the forest early in the morning.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a Pteromys volans orii flying squirrel eating a male catkin from an Erman's birch tree (Betula ermanii) on a snowy day.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a male Pteromys volans orii flying squirrel sitting at the entrance to his nest.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a male Pteromys volans orii flying squirrel looking into the entrance of a nest with a female inside. During reproductive season, males often do this in hopes of find receptive females. In many instances, females approaching estrus are already accompanied by males. Conflicts between males often ensue.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a male Pteromys volans orii flying squirrel defecating while perched in a safe place on a cloudy, overcast day.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a female Pteromys volans orii flying squirrel looking out from the entrance to her nest.
    pteromys-volans-orii-flying-squirrel...tif
  • This is a male Pteromys volans orii flying squirrel making his appearance in the late afternoon, just before heading up into the treetops to forage.
    pteromys-volans-orii-flying-squirrel...tif
  • Close-up view of a Pteromys volans orii flying squirrel finishing off a meal of male catkins from an Erman's birch tree (Betula ermanii)
    pteromys-volans-orii-flying-squirrel...tif
  • This composite image shows a Pteromys volans orii flying squirrel defecating for a duration of about 20 seconds after it had emerged from its nest to forage.
    pteromys-volans-orii-flying-squirrel...tif
  • Pteromys volans orii flying squirrels often have favored locations for defecation.
    pteromys-volans-orii-flying-squirrel...tif
  • This Pteromys volans orii flying squirrel is relishing fresh buds of a small branch from a Japanese elm tree (Ulmus davidiana var. japonica).
    pteromys-volans-orii-flying-squirrel...tif
  • This is a head-on view of a Pteromys volans orii flying squirrel gliding through the forest.
    pteromys-volans-orii-flying-squirrel...tif
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Tony Wu Underwater Photography

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