Ondatra J.R. Alcorn 1940 Canvasback Gun Club, 5 1/2 mi. N Stillwater, Churchill co., Nev. Aug. 25. Mr. L.R. Emerson of Stillwater, Nev., has lived on the Canvasback Gun Club hunting grounds about 10 yrs and relative to Muskrats Mr. Emerson says, If the rats are able to burrow into a bank and get above water level or high water, they do so, otherwise they build a house of dead tiles and there make a nest. This house has from 2 to 5 openings all under water. The house averages about 4 ft. above water line. House is about 5 feet in diameter at water line, depending of number of rats using the house. ?th winter, 15 to 30 rats use one house. The colder the weather the more rats to be found in one nest. The more rats to a house, the greater diameter at water line that house is stays about the same height.