Female brown-headed cowbirds lay eggs in other birds' nests. Find out what you should do if you see cowbird eggs.

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

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?

Eggs helped animals conquer land—but most mammals stopped laying them. Why is that? Why do most animals lay eggs, while humans and most mammals give birth to live young? In this episode of Big Ideas ...

What qualifies as a great egg? It’s not size, and it’s not how white the shell looks. A great egg has a yolk so rich it leans ...