Animals with larger brains produce fewer, larger offspring, explaining why birds evolved bigger eggs than the largest dinosaurs.

Nesting season is not done yet! Learn the bird nesting basics of these late nesters and find out how to attract them to your yard.

Desert birds lay larger eggs when they have more helpers to feed their chicks, new research shows. White-browed sparrow weavers live in family groups in which only a dominant pair breeds and their ...

To keep eggs alive, many birds do something far stranger than simply sitting on them. Their bodies physically transform in ...

A new study has uncovered a fundamental link between brain size and offspring size, helping to solve a long-standing evolutionary puzzle: Why do birds lay such disproportionately large eggs?

CHICAGO — It’s springtime, and the birds are chirping as they begin to build their nests. Researchers say the hands-on clock is turning back, though it happens like clockwork each year. Many species ...

White-browed sparrow weavers live in family groups in which only a dominant pair breeds and their grown-up offspring, particularly females, help to feed nestlings. The study, by researchers at the ...