and some birds even build nests that hang from branches, like delicate Christmas tree ornaments. Then, there are pigeons, who do things a bit ... differently. Pigeon nests typically consist of ...

In a video of a sun-drenched yard, a cat relaxes in the branch of a tree, with a man-made birdbox above him. But rather than waiting for prey, he's getting a haircut—from a tiny bird, who is pulling ...

But as natural habitats have dwindled and human practices have changed over the centuries, the number of trees with suitable cavities for bird nests has declined markedly. There are more than 60 ...