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Japanese giant salamanders grow five feet long

The Japanese giant salamander is the world's second-largest salamander, reaching up to 5 feet and 55 pounds.

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Only the Chinese giant salamander is bigger. These long-lived amphibians keep to Japan's rocky, fast-flowing streams.

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Jellyfish are about 95 percent water

Only about five percent of the body of a jellyfish is solid matter. The rest is water.

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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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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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