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
Hidden warmth
The Bear's Black Skin
Under all that white fur, a polar bear's skin is actually jet black.
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.