Find out what actually attracts bluebirds—from the foods they love to the simple yard changes that make them stay.

Explore 25 strange new species scientists recently discovered, from giant anacondas to Darth Vader sea bugs. Dive into Earth's hidden biodiversity. Discove ...

Introduced species can wreak havoc on native ecosystems. Many states are flooding their waterways with them.

While both cats and snakes have slit-like pupils, the similarity ends there. It’s a case of convergent evolution--understand ...