Beluga whales are a "bellwether species" for Russia's melting Arctic.

Chicks of Australian cuckoos are found to be masters of deception.

A frog can tune its ears to different sound frequencies, like the tuner on a radio.

A federal judge restores endangered species protections for Rockies gray wolves.

No-take marine reserves protect coral by controlling invasive starfish.

Hundreds of penguins are found dead on the beaches of Rio de Janeiro.