A dense group of sperm whales (Physeter macrocephalus) that were part of a massive social gathering of hundreds of individuals. As shown here, sperm whales seem to defecate frequently when they are at the surface, especially during intense social activity. The whales' defecation and other bodily excretions imparted an oily consistency to the seawater, as can be seen here, backlit by the low light of the late-afternoon sun. Besides socializing in this manner, the large gathering of sperm whales were also foraging for food in between bouts of surface activity.
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