No systematic study of mammals in the immediate ELA region has been conducted.
Of the species known to inhabit the area, several have been particularly apparent to ELA personnel over the years. Red squirrels and least chipmunks are common around the field station and elsewhere. Snowshoe hares undergo major population fluctuations but can be extremely common during peak periods.
Beaver were uncommon during the early years of ELA operation, when mature forest covered most of the area. However, in the aftermath of logging and forest fires, the beaver population has increased markedly and many lakes now have active beaver colonies. Among the larger game species, white-tailed deer and moose are present.
In the early 1970's, white-tailed deer probably outnumbered moose. After logging and fires, the moose habitat increased and the moose population grew significantly, displacing the white-tails. Now the smaller deer seem to be moving back into the area. Black bears have always been common, with the black colour phase predominating and occasional brown individuals being noted.
Other species confirmed as resident include red foxes, coyotes, wolves, marten, otters, mink, weasels, striped skunks, porcupines, and woodchucks. At least two cougar sightings has been reported, although not confirmed.