Photo of the Day

Why walruses need summer sea ice

Mercury is contaminating the Grand Canyon's fish and wildlife

How to view a meteor shower

4 fascinating facts about the puffin's clown-like beak

5 facts about the family life of wolves

Why planting a garden is better for bird-watching than filling a feeder

The surprising beauty of Alaska's tundra flowers

Exactly what are the ocean's tides?

5 startling statistics about elephants on World Elephant Day

Why do humpback whales breach?

Stunning mountain sunrise reflected in a mirror-calm lake

You can put this lizard on the lunch menu