There are as many as 18,000 species of birds in the world with ... Striking photos of eggs that show how different birds build ... David Tipling/Education Images/Universal Images Group via ...

The multiple open-cup nests (pictured below) are the work of many different birds, but have all been commandeered by the common cuckoo, which lays its eggs in the nests of more than 100 other bird ...

Many “birds of a feather flock together,” but not all, and those that do, indulge in different degrees of flocking. “Birds of a feather” means one species, but sometimes a flock can ...