Boost your joy with 'Planet Earth' unplugged

Why aren't the biggest animals also the fastest?

7 species with 'superpowers' thanks to evolution and invasion

A state of emergency for turtles has been declared in Ontario

Spirit of Henry David Thoreau's 'Walden' lives on at state park

School-age boy saves a species after quest to find an 'extinct' frog

Thousands of bulging methane bubbles could explode in Siberia

These wild birds fashion drumsticks and make original beats

Just because the sun isn't shining, doesn't mean it isn't beautiful outside

Scientists solve an ancient animal riddle that stumped Darwin himself

Finches add cigarette butts to their nests to ward off pests

How do you transplant a giant sequoia? Very carefully