A Purple Finch in the middle of molting makes for a strange picture but is an essential part of the bird's life.

When preparing for these surveys, birders have much to anticipate about the species they may find. One question that's always ...

After a decades-long hiatus, new world screwworm populations have surged in Central America and Mexico — and are inching northward.

All over the world, young couples are setting up home and creating a safe place for their family to grow. The amphibian ...