Fluke-on view of a group of sperm whales (Physeter macrocephalus) socializing. The whales are clustered together head-first, with lots of bio-sonar clicking and rubbing together of their heads and bodies. Mass defecation is often a part of such social activity, with the defecation becoming thick enough to obscure the whales from view, as is the case here. Note the shedding of skin, which is also characteristic of sperm whale socialization.
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