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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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There are about 8,550 living species. Their skeletons are dense yet porous, and the animals are highly adapted to where they live.

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The emu is the second-largest living bird

The emu is the second-largest living bird and the largest in Australia, averaging 5.7 feet tall.

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Humpback whales migrate up to 5,000 miles

Some humpback whales swim 5,000 miles between tropical breeding grounds and colder feeding grounds.

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Male seahorses get pregnant and give birth

Seahorses and their close relatives, sea dragons, are the only species in which the male gets pregnant and gives birth.

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