Keywords: otters national wildlife refuge nationalwildliferefuge north carolina northcarolina wildlife u. s. fish and wildlife service usfishandwildlifeservice national wildlife refuge system nationalwildliferefugesystem These two North American River Otters live at Pea Island National Wildlife Refuge. Otters are natural swimmers that can hold their breath under water for up to eight minutes. Photo credit: Marilyn Kircus These two North American River Otters live at Pea Island National Wildlife Refuge. Otters are natural swimmers that can hold their breath under water for up to eight minutes. Photo credit: Marilyn Kircus |