Sperm whales adopt deformed dolphin.
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In 2011, behavioral ecologists Alexander Wilson and Jens Krause of the Leibniz-Institute of Freshwater Ecology and Inland Fisheries in Berlin found a mixed-species group of sperm whales, including several whale calves and an adult male bottlenose dolphin. They located this unusual group approximately 15 to 20 kilometers off the island of Pico in the Azores.
For more than a week, Wilson and Krause observed the dolphin while it nuzzled and rubbed members of the mixed-species group. They noted that the sperm whales seemed to be okay with the attention from the deformed dolphin.