SquirrelFamily:Sciuridae

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ChipmunkFamily:Sciuridae

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MarmotFamily:Sciuridae

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Prairie DogFamily:Sciuridae

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BeaverFamily:Castoridae

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Kangaroo RatFamily:Heteromyidae

Photo: US Fish & Wildlife@Wikimedia Commons License: Public Domain

Bottas Pocket GopherFamily:Geomyidae

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JerboaFamily:Dipodidae

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Roborovskis Dwarf HamsterFamily:Cricetidae

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Bank VoleFamily:Cricetidae

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MuskratFamily:Cricetidae

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Deer MouseFamily:Cricetidae

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GerbilFamily:Muridae

This family includes old world (European) rats and mice.
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SpringhaasFamily:Pedetidae

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GundiFamily:Ctenodactylidae

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Naked Mole RatFamily:Bathyergidae

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African PorcupineFamily:Hystricidae

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North American PorcupineFamily:Erethizontidae

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ChinchillaFamily:Chinchillidae

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CapybaraFamily:Caviidae

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CapybarasFamily:Caviidae

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Guinea PigFamily:Caviidae

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Red-Rumped AgoutiFamily:Dasyproctidae

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NutriaFamily:Myocastoridae

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HutiaFamily:Capromyidae

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33 Families, 2277 Species
Rats, mice, squirrels, capybara
Worldwide (not Antarctica)
Incisors & cheek teeth separated by diastema, ever–growing incisors
6 g to over 50 kg.

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