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No two tigers have the same stripes

Like a human fingerprint, a tiger's stripe pattern is unique to that animal.

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Researchers use the patterns to tell individual tigers apart. Tigers are also strong swimmers and have been recorded hunting in the water.

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Open Smithsonian National Zoo

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Fennec foxes are the smallest wild canids

Fennec foxes are the smallest members of the dog family and can go long periods without drinking water.

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Ostriches have the largest eyes of any bird

An ostrich's eyes are about 2 inches wide, the largest of any bird.

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Sloth fur can turn green with algae

The coarse outer hair of a two-toed sloth turns green in moist conditions because algae grow on it.

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