Story
A tooth that senses the sea
The Unicorn of the Sea
A narwhal's long, spiraled tusk isn't a horn at all — it's actually a giant tooth, longer than a grown-up is tall, packed with nerve endings that can sense the water around it.
Habitat
Ice & snow wonders
Story
Chasing endless sunlight
The Bird of Two Summers
Every year, a small Arctic tern flies from one end of the Earth to the other and back again, farther than one full trip around the entire planet.
Story
Hidden warmth
The Bear's Black Skin
Under all that white fur, a polar bear's skin is actually jet black.