Migration patterns of the song sparrow are confusing, as some do not migrate at all, but in general the bird is in no rush to ...

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 ...

About a third of Chicago-area bird species are laying their eggs earlier than normal, a study recently published in the Journal of Animal Ecology found. Researchers believe the change in nesting is ...

A third of bird species in Chicago are laying their eggs a month earlier than they did 100 years ago, according to a new study that compares recent observations with data from century-old eggs.

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 ...

Some birds use brood parasitism. They lay eggs in other species' nests. Indigobirds trick finches. Common Cuckoos mimic predators. Honeyguides kill host young. Brown-headed Cowbirds outcompete chicks.

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 ...

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 ...

Most people assume that only reptiles, fish, and birds lay eggs — after all, that’s what we learned in school. But nature always has a few surprises up its sleeve. Believe it or not, there are ...

A critically-endangered bird is making a comeback on the Galapagos Islands. Experts from the Charles Darwin Foundation and the Galapagos National Park Directorate who formed part of The Mangrove Finch ...