Portrait close up shot of a small nutria, myocastor coypus by the river bank surrounded by large swarm of midges flies at Lago de regatas, Buenos Aires

nutria myocastor coypus coypu river species animal invasive coipo beaver rat rodent swamp wild wildlife native south america europe nature natural habitat lake lakeside eat forage feed wet urban park pest otter environment invasion fur food mice mouse midge fly chironomids swarm pond water chew bank riverside lago de regatas buenos aires argentina