News Animals

Brains for a change

Bigger brains go with more variety in body size

By Susan Milius

- More than 2 years ago

For size, brains matter.

BRAIN FORCE Sheer brain power may have been a force in evolution of certain bird lineages such as parrots, speeding up the diversification of their body sizes. PhotoDisc

Brainpower by itself seems to be a force in evolution, at least in developing diversity of body size in birds, two researchers report in the August American Naturalist.