: a large, chiefly tree-dwelling, dark gray squirrel (Sciurus aberti) with long tufted ears and white underparts that is found primarily in forests of ponderosa pine in Arizona, New Mexico, Colorado, Utah, and northern Mexico
Mule deer, Abert squirrels and other wildlife often appear along the trails …— Nancy Muenker, Denver Post, 2003… the only wildlife we spotted, other than birds and lizards, was an Abert's squirrel, which shook its bushy, skunklike tail at us before scampering into the woods.— John Stanley, Arizona Republic, 2009
—called also
tassel-eared squirrel
First Known Use of Abert squirrel
1853, in the meaning defined above
History and Etymology for Abert squirrel
after James W. Abert †1897 American soldier and scientist