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  • 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
  • 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
  • Pictured here is a male Pteromys volans orii flying squirrel (left) checking the reproductive status of a female (right). The female was approaching estrus. This male was doing his best to keep other males away, having to engage in combat several times a day in order to do so.
    pteromys-volans-orii-flying-squirrel...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
  • This is a male Pteromys volans orii flying squirrel standing guard at the entrance to his nest. Inside is a female nearing estrus. This means frequent visits by rival males that he has to chase away.
    pteromys-volans-orii-flying-squirrel...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 the moment when a male Pteromys volans orii flying squirrel inside the nest has heat-butted a potential rival male that was looking into the nest with the objective of gaining access to the female inside, which was approaching estrus. Even after being chased off, rival males like this often return to try again. Females sometimes choose to mate with multiple partners.
    pteromys-volans-orii-flying-squirrel...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
  • Adult female humpback whale with calf. This mother and calf pair were surrounded and being pursued by at least four escort whales. The frenzy of males associated with this female and calf was reminiscent of a similar situation I encountered with the mother of the injured calf Tahafa (201114) in 2011. There was a long-term association between that that female/ calf and an escort. At one point, many males converged upon and assailed the escort, engaging in heavy physical contact. The next day, all the males, including the long-term escort, disappeared. Having seen this pattern of behavior a few times, I believe this may indicate estrus or similar state of reproductive receptivity by the adult female.
    humpback-whale-female-and-calf-tonga...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
  • 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 one in a series of three which illustrate the height of the nest.
    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 first in a series of three which illustrate the height of the nest.
    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
  • During reproductive season, Pteromys volans orii flying squirrel males sometimes compete for females that have gone into estrus. Pictured here are two male rivals. One is guarding the entrance to a hole in a tree. Inside is the female. The other male is sneaking up from the other side of the tree with the intention of challenging the ensconced male.
    japanese-flying-squirrel-pteromys-vo...tif
  • This is a pair of Pteromys volans orii flying squirrels that have emerged from the nest at dusk. The female seated above is entering estrus. The male is checking her readiness for mating.
    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
  • This is a Pteromys volans orii Japanese dwarf flying squirrel flying through the forest during a flurry of activity involving five individuals, two females and three males. The two females were in estrus.
    japanese-flying-squirrel-pteromys-vo...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 standing guard at the entrance of a nest. Inside is a female that has entered estrus. This has attracted the attention of another male. At this point, the interloper male had made numerous attempts to mate with the female, hence the protective position of this male. 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.
    japanese-flying-squirrel-pteromys-vo...tif
  • The Pteromys volans orii flying squirrel male seen fleeing up the tree in this photograph had just been chased off by the male poking his head out of the nest. The reason for this conflict was a female inside the nest. She was approaching estrus.
    pteromys-volans-orii-flying-squirrel...tif
  • Female humpback whale calf (Megaptera novaeangliae) and its mother with multiple escort male humpbacks. There was a frenzy of males around this mother and calf pair. I have seen this type of behavior on multiple occasions. I believe it may have something to do with the adult female being in estrus, receptive to potential mating opportunities for a limited duration.
    humpback-whale-female-with-calf-mult...tif
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