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 ...

Fork-tailed drongos have a signature color and pattern on their eggs, which helps them avoid getting duped by African cuckoos. Hans Stieglitz via Wikimedia Commons under CC BY-SA 3.0 Cuckoos have ...

Female lineages of European cuckoos lay eggs with colorful shells and intricate patterns specialized to deceive more than 100 avian hosts into fostering their chicks. Parasitic cuckoo eggshells show ...

Across the animal kingdom, eggs can appear green, brown, pink, and even bright blue depending on the species that lays them.

Climate change is causing some species of birds to lay their eggs a month earlier than normal. A study recently published in the Journal of Animal Ecology reports that roughly a third of all bird ...

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 ...

LONDON, March 25 (Reuters) - The early bird is getting even earlier. With climate change spurring earlier springs across much of North America, many birds are laying their eggs earlier in the year, ...

A once-extinct bird is laying eggs in the wild for the first time in nearly 40 years. Sihek, a now-endangered bird returned to the wild in 2024, has laid wild eggs in its new home in Hawaii, according ...