Baby female humpback whale with mammary slits visible | Tonga

This is Ikumi, the fifth humpback whale calf ID-ed during my 2010 humpback whale season in Tonga. Ikumi is a little female calf that was unusually friendly, with a relatively calm mother who let the calf play at the surface alone for extended periods of time. Here, the calf has just dived below to surface to swim down to her mother, just barely visible in the deep. I recorded ten encounters with this mother and calf over a 15-day period, the longest continuous stretch I've recorded to date with a given mother and calf pair. During the first encounters, Ikumi was too young to have developed clearly identifiable sexual characteristics. Toward the end of the 15-day period, Ikumi's mammary slits became visible, as in this photograph, making it possible to ascertain her sex.

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Filename: baby-humpback-whale-with-mammary-slits-visible-tonga-201008-3949.tif
Copyright: Copyright Tony Wu. All rights reserved. No duplication without prior written permission
Image Size: 3456x5184 / 51.3MB; https://www.photoshelter.com/support/license#rm; https://www.tony-wu.com/contact-tony-wu; South Pacific Tonga Vava'u Humpback Whale Animalia Chordata Mammalia Cetartiodactyla Eutheria Cetacea Mysticeti Balaenopteridae Marine Mammal Baleen Whale Rorqual Mysticete Megaptera novaeangliae Endangered: IUCN Red List CITES Appendix 1 Filter Feeder Calf Juvenile Female
Contained in galleries: Humpback Whales Underwater

This is Ikumi, the fifth humpback whale calf ID-ed during my 2010 humpback whale season in Tonga. Ikumi is a little female calf that was unusually friendly, with a relatively calm mother who let the calf play at the surface alone for extended periods of time. Here, the calf has just dived below to surface to swim down to her mother, just barely visible in the deep. I recorded ten encounters with this mother and calf over a 15-day period, the longest continuous stretch I've recorded to date with a given mother and calf pair. During the first encounters, Ikumi was too young to have developed clearly identifiable sexual characteristics. Toward the end of the 15-day period, Ikumi's mammary slits became visible, as in this photograph, making it possible to ascertain her sex.