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Over 7,700 species

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They've evolved to have no true teeth.

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They inflate the lungs to create a larger image to the predator.

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Around 767 species

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They have night vision.

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They can use skin secretions, tail dropping, and head butting.

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There are over 220 living species.

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They have vestigial limbs, which are evidence that they evolved from a legged ancestor.

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The upper jaw protrudes beyond the lower jaw, allowing prey to be captured in narrow spaces yet not interfering with the head's use in burrowing.