In terms of mammals, nearly every mammal commonly found in Eastern Iowa or Western Illinois has been observed here, including foxes, bobcats, river otters, weasels, white-tailed deer, beavers, and a healthy population of muskrats.
The homes of muskrats look like piles of cattails, sedges or other plant material and can seen scattered along the edges of the marsh. With so many muskrats, Nahant Marsh also has a healthy population of mink, who’s favorite meal is muskrat.
Mink can generally be observed slinking around the waterways at dusk or dawn. They travel from muskrat lodge to muskrat lodge, looking for a dinner.