- from Birds
“Eats like a bird” is an old expression that means someone is a light eater.
Whoever made that up didn’t know birds. They’re big eaters—partly because flying takes so much energy. A baby warbler may eat almost its own weight in insects each day. Every species has its own diet. But as a group, birds will eat just about anything—berries, nuts, insects, fish, small animals—and even other birds.