PHOTOS: River otters reclaim their turf at Beaver Marsh in Cuyahoga Valley National Park

River otters have returned to their home at the Cuyahoga Valley National Park. The return of the river otters is a sign of the park's environmental health. Otters are native to Ohio and were reintroduced to several rivers in the state. Walking along Beaver Marsh in the park, visitors may get a glimpse into the lives of these fast, agile swimmers.