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?

Bird nesting happens in spring. That's common knowledge, right? Actually, it's not always the case. Even though we associate nesting birds with springtime, some birds do nest and lay eggs in other ...

Egg-collecting enthusiasts in the late 1880s knew the hobby was crucial for understanding the natural world, but likely never imagined that their research would help scientists more than 100 years ...

Because they are the ancestors of the avian dinosaurs, scientifically speaking, birds are closely related to reptiles. This kinship between birds and modern reptiles is evident in their eggs, which ...