pocket mouse

noun
any of numerous burrowing rodents, especially of the genus Perognathus, chiefly inhabiting arid regions of the southwestern U.S. and northern Mexico, having fur-lined cheek pouches and a long tail.

Origin:
1880–85, Americanism

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Collins
World English Dictionary
pocket mouse
 
n
any small mouselike rodent with cheek pouches, of the genus Perognathus, of desert regions of W North America: family Heteromyidae

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
When not watching for the evil rodent, he must also contend with a pick-pocket mouse.
The pocket mouse lives in arid habitats, therefore all water needs are metabolized through seed digestion.
The long-tail pocket mouse, a close relative of kangaroo rats, exhibits cheek pouches characteristic of this family of rodents.
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