How many nerve cells are there in a bird's brain?

While humans have about 100 billion nerve cells in their bodies, other mammals, such as blue whales, boast at least twice that number. The University of Tennessee points out that the elephant's brain is about three times as big as that of a human and contains about three times as many nerves. read more

These numbers are estimates derived by multiplying the density of neurons in a particular animal by the average volume of the animal's brain. The whole human brain contains 86 billion neurons and roughly 16 billion neurons in the cerebral cortex. read more