Sperm whales have the largest brain of any living animal, weighing up to 9 kilograms (nearly 20 lbs), a key reason scientists believe they possess advanced communication and social intelligence. They ...
Whalers pursued sperm whales for the rich oil in their oversized heads. Now biologists are on the tail of these deep-diving, long-lived, sociable and mysterious sea creatures. Gerard Soury / Oxford ...
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