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A narwhal's tusk is a tooth

Male narwhals have a tooth that grows into a long, clockwise-spiraled tusk.

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Narwhals live in the Arctic Ocean. They grow 13 to 18 feet long and can live up to 50 years.

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Beluga whales can nod and turn their heads

Unlike other whales and dolphins, belugas have neck vertebrae that are not fused, so they can nod and turn their heads.

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Pronghorn can run 55 miles per hour

A pronghorn can run at a top speed of around 55 miles per hour.

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Sponges are animals 600 million years in the making

Sponges are simple aquatic animals, and their fossil record goes back about 600 million years.

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