When a female cowbird is ready to have a baby, she’ll stake out another bird’s nest, wait until the coast is clear, then slip ...

When it comes to bird eggs, most people imagine the standard brown or white varieties. However, nature has a surprise in ...

For eastern phoebes, a single nest requires so much incubating that splitting up the effort is almost sure to fail.

Birds are descended from egg-laying dinosaurs, and before you ask that age-old question, the egg came first. It was very different from eggs we are familiar with these days.