Rodents

If you come face-to-face with a mammal, chances are it could well be a rodent as they account for around 40 per cent of all known mammalian species. And it's their face that holds the secret as to what makes them rodents - their pair of continually-growing incisors in their upper and lower jaws. Some are tiny, like the 4cm-long dwarf three-toed jerboa, and some are massive, while the 66kg capybara is enormous, but most are around 100g, and can be found all over the world (except Antarctica).

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