The female will initially protect the nest, while the male forages (or hunts). Being smaller means they will eat less and therefore can bring back more food.
As the female is protecting the nest, theoretically is spending less energy and using her size to intimidate possible predators.
Same applies to birds of prey. The female is consistently larger than the male.
The female will initially protect the nest, while the male forages (or hunts). Being smaller means they will eat less and therefore can bring back more food. As the female is protecting the nest, theoretically is spending less energy and using her size to intimidate possible predators.
Oh yeah? What about Black Canary?