Overview of the Nesting Cycle

More than 700 bird species breed in North America, and the variations in their behaviors are fascinating and complex. Different species find mates, build nests, lay eggs, and raise their young in different ways. Click on the links below for more details.

Finding a place to breed

Well before nestlings arrive, birds need to select a breeding territory...

Choosing a mate

While territories are being claimed, males and females also try to attract mates...

Nest building

Nest provide a safe place for the eggs and young...

Copulation and egg formation

If all goes well, the sperm penetrate through the wall of the ovum (egg) and fertilization takes place...

Egg laying and incubation

The number of eggs a female lays in one nesting attempt (also known as clutch size) varies widely depending on the species....

Hatching

Learn the difference between altricial and precocial young.

Feeding and raising young

To keep up with demand, parents must supply food for themselves and their young...

Leaving the nest

After leaving the nest, or fledging, the young birds typically remain close to parents for a short period of time...