The number of eggs a bird lays — its clutch size — varies greatly among species. You might think every species should simply lay lots of eggs because that would increase the odds of more young birds ...

Bird watchers love to see their favorite avians indulge in their yard's feeder or make a splash in their bird bath before taking flight again. When we begin to see these birds at the top of the ...

CNN — 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 ...

During a birdwatching stroll last spring, John Bates spotted a newly hatched killdeer chick. Common in North America, the long-legged birds often dart across the ground hunting for insects. Bates ...

Spring is in the air. Birds are singing and beginning to build their nests. It happens every year, like clockwork. But a new study in the Journal of Animal Ecology shows that many species of birds are ...

Of all the vertebrates on Earth—that is, animals with backbones—birds are the only ones that lay colorful eggs. Scientists are still unsure why, but new research brings us a step closer to finding out ...

Many species of birds are nesting and laying eggs nearly a month earlier than they did 100 years ago in the Chicago area and researchers believe climate change is behind it. Those were among the ...

Nests are generally thought of as a bird’s home, but it is more appropriate to consider them a nursery for raising baby birds. S.K. Winnicki, a Ph.D. candidate in avian evolutionary ecology at the ...

An Australian study reveals a surprising phenomenon: male birds laying eggs due to sex reversal. Researchers found that some birds' genetic makeup didn't align with their physical characteristics, ...