Sperm Whale Has 7.8kg Brain, About 5 Times a Human's

2 articles · Updated · BBC Discover Wildlife · Aug 16

7.8kg is the average brain weight of an adult male sperm whale, versus about 1.4kg for a human, giving the species the largest brain in the animal kingdom.
A sperm whale’s squarish head can make up as much as one-third of its body length, with much of that mass tied to the spermaceti organ rather than the brain alone.
That organ contains a pale, waxy liquid once heavily prized by whalers and is now thought to help with buoyancy control and an advanced acoustic sensory system.
Those sensory abilities support navigation in a complex three-dimensional environment and help sperm whales maintain intricate social bonds.