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Rice, William R. 1982. Acoustical location of prey by the marsh hawk: <br /> adaptation to concealed prey. Auk 99(3):403-413. <br /> Selleck,David M.and Ben Glading. 1943. Food habits of nesting barn owls and <br /> marsh hawks at Dune Lakes, California, as determined by the "Cage <br /> Nest" method. California Fish and Game 24(3): 122-131. <br />