The first study to systematically measure the number of neurons in the brains of more than two dozen species of birds has found that the birds that were studied consistently have more neurons packed into their small brains than those in mammalian or even primate brains of the same mass.
The study results were published online in an open-access paper in the Proceedings of the National Academy of Sciences early edition on the week of June 13.
Image: The macaw has a brain the size of an unshelled walnut, compared to the macaque monkey’s lemon-sized brain. But the macaw has more neurons in its forebrain — the portion of the brain associated with intelligent behavior — than the macaque. (credit: Vanderbilt University)
