High Quality Content by WIKIPEDIA articles! The Woolly-headed Spiny Tree-rat (Mesomys leniceps) is a species of rodent in the Echimyidae family. It is endemic to Peru. Rodentia is an order of mammals also known as rodents, characterised by two continuously growing incisors in the upper and lower jaws which must be kept short by gnawing. Forty percent of mammal species are rodents, and they are found in vast numbers on all continents other than Antarctica. Common rodents include mice, rats, squirrels, porcupines, beavers, chipmunks, guinea pigs, and voles.

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