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 ...

Black birds with a greenish sheen and brown heads sometimes visit my yard during spring migration. These are male brown-headed cowbirds, and they often arrive in mixed flocks of red-winged blackbirds ...

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

So, you've spotted some unfamiliar eggs in your garden. What next? Here are some tips for identifying common animal eggs and ...

It was nature’s version of an Easter egg hunt. Dr. Claire Spottiswoode, a professor at the University of Cape Town who studies avian (bird) brood parasites, was working in Zambia to learn more about ...

Southeast area residents of Woodland residents may be fighting a losing battle against those “no-see-ems” swarming out of the Yolo Bypass this time of year. But the birds which feed in part on the ...