The following is a list of mammals, amphibians and reptiles seen at the Neilson Spearhead Center by previous caretakers, researchers and visitors. Not all of the fauna listed are direct sightings; rather, a few listed are sightings of tracks, dens, skulls and skeletons.
Porcupin
Eastern chipmunk
Red squirrel
Flying squirrel
Snowshoe hare
White-tailed deer
Deer mouse
Woodchuck
Beaver
Weasel
Mink
Skunk
Red fox
Coyote
Timber wolf
Black bear
Muskrat
Masked shrew
Short-tailed shrew
Northern prairie skink
Red-sided garter snake
Wood frog
American toad
