Bad placement can result in birds avoiding the spots you meant to draw them to. While birdfeeders are often best placed among the shelter of branches and hanging from a tree, you may be tempted to ...

Use the telescope from Challenge 5 to help you observe the birds and their tree home. Watch if a certain branch is more popular for birds to land on, or if you can find a nest. (Hint: If a bird ...

Biologists previously believed modern birds had evolved 20 million years later than the new evidence suggests.

Under this system, organisms are grouped into "clades," which are distinct branches on the phylogenetic tree that include all the descendants of a most recent shared ancestor. For example, modern ...

The American tree sparrow often occurs in flocks of up to 50 birds. In habitat and behavior, they are much like field sparrows, but American tree sparrows are more frequent at bird feeders.

An Anna’s hummingbird calls out from the bare branch of a Hachiya persimmon tree in a Santa Cruz backyard. According to ...