Muskrat (Ondatra zibethicus)

the only species in genus Ondatra and tribe Ondatrini, is a medium-sized semiaquatic rodent native to North America

 

Muskrats have a second set of lips that closes behind their front incisors so they can dive underwater, chew and eat without swallowing water.

Those incisors, like a rat's or a beaver's, are ever-growing, so they have to gnaw things to keep them under control.

 

 

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