Photograph of a Marsh Hawks nest (Circus hudsonius). This nest is located in tall grasses of a sraw in a mixed-grass pasture, which has been "rested" for 5 yrs. 11 pellets picked up from around nest and analyzed by Denver Laboratory of U.S. Biological Survey were composed as follows: 3 cottontail (Sylvilagus), 3 cotton-rat (Sigmodon hispidus), 2 ground-squirrel (Citillus 13-linsatus), 1 house mouse (Mus musculus), 1 horned lark (Otocoris), and 1 mouse (Mus) and bird (sparrow?).