muskrat munching,

muskrat munching,

muskrat close-up

Evidence of steep declines in muskrat numbers have been observed throughout the animal’s native range. A number of theories to explain the drop in muskrat population have been proposed, including habitat loss, predation, environmental contamination and diseases. This study, led by Penn State researchers, examines a number of those possibilities.

IMAGE: Kevin Vance/Flickr