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Tree frog with strange claw discovered in remote Andean dwarf forest

The secret lives of hummingbirds with sword-like beaks

California's monarch butterfly population drops 86% in single year

The North Atlantic right whale could be extinct in 20 years

Meet India's beautiful technicolor squirrels

Woodland animals leap from the screen in Finnish photographer's work

Watch the world's only known albino orangutan return to the wild

This spooky deep-sea fish haunts the ocean floor off the coast of Rhode Island

14 of history's greatest polar explorers

Mysterious Texas canines have 'ghost' DNA of red wolves

Baby sharks hunt down their siblings while still in the womb