What other animals are chinchillas related to?

Chinchillas are rodents (order Rodentia)

They are most closely related to other rodents known as cavylike rodents (suborder caviomorpha).

Some of the most defining features of this group are a large head relavtive to body size, slender limbs, a stout body and a short tail. Also, the arrangement of the jaw muscles helps create the power needed for a strong forward bite. In fact, the cavylike rodents are distinguished from the other types of rodents by the jaw muscle organization.

The other two rodent groups are squirrel-like rodents (suborder sciuromorpha) and mouselike rodents (suborder myomorpha).

Other species in the suborder caviomorpha are:

 

North American porcupine

northamericanporcupine

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Cape porcupine

cape porcupine

photo by emijrp on wikimedia

 

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Prehinsile-tailed porcupine

image by Cliff on Wikimedia

 

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Brazilian guinea pig

photo by petra karstedt on wikimedia

 

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Capybara

Photo by Kulmalukko on Wikimedia

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Patagonian mara

photo by Drow-Male on wikimedia

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Azara's agouti

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Paca

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Plains viscacha

Photo by Salix on Wikimedia

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Desmarest's hutia

Photo by Jensflorian on Wikimedia

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Degu

Photo by Jacek555 on Wikimedia

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Nutria

Naked mole-rat

African mole-rat

Namaqua dune mole-rat