According to Chris Anchor, senior wildlife biologist with Forest Preserves of Cook County otters are making a comeback in the Chicago area and in the Chicago River system. He sighted one on South Branch, seen evidence behind the Lyric Opera, and monitored a male that spent a winter in a FPCC pond and then swam up the Cal-Sag to the Des Plaines River where he met some females near River Trails Nature Center in Northbrook traveling more than 40 miles by water.
According to Anchor river otters are an apex predator and "rely on the health of the entire wetland ecosystem to survive." By understanding river otter behavior, researchers can figure out what kinds of habitat restoration will benefit them most. "We didn't think the (Chicago River) water quality was good enough," said Anchor in one interview. "Of particular concern was the gas and oil runoff from local roads; experts feared it would enter waterways and interfere with the water-repellent qualities of the otters' fur, causing hypothermia."
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