Male Japanese quails produce a strange seminal foam that appears to enhance the chances of successfully fertilizing an egg.

2. Kiwis lay the biggest eggs in relation to body size of any bird—each egg is around 20 percent of the mother’s total body weight. It takes a female kiwi a month to produce a single egg, and ...

The bird kingdom is filled with intriguing mysteries, from the oldest birds that defy ageing myths to birds who have an ...

Female hummingbirds tending to a nest full of eggs or chicks are working their tail feathers. They're either warming their ...

Japanese quail: The bird with weird sperm foam, ... they're not able to select the best place to lay their eggs." Scientists think birds use patterning on eggs for camouflage, ...

That is not photoshopped. It is an actual x-ray image showing an egg roughly one-quarter the mass of the bird carrying it. If humans carried babies that big, we’d give birth to 30-pound infants.

The largest commercial egg producers own millions of birds. A single laying house holds as many as 350,000, serried into wire crates and stacked on top of one another. The virus spreads rapidly in ...

It’s spring. A female hoopoe—a bird that looks like a pickaxe painted in a tiger’s colours—lays her eggs in a hole within a tree. The eggs come out milky blue, but they soon change colour ...

It’s spring, and baby birds will soon be chirping in trees and rain gutters. But not all bird nests are created equal. Whether from mud, leaves, or saliva, here are 10 birds that make some of ...

Birds may decorate nests with artificial objects and feathers to deter magpies and ravens from taking their eggs. Many birds have been observed placing human-made objects in their nests, such as ...