. The birds of Illinois and Wisconsin . Coopers Hawk. Illustrating comparative difference in size Red-shouldered Hawk. Male: Length, 19 to ; wing, to 16; tail, to 10;tarsus, to 3. Female: Length, to 24; wing, to ; tail, 9 to ;tarsus, to This is the common form of Red-tailed Hawk in Illinois and Wis-consin and breeds in both states. The adult may be easily recog-nized by its size and rufous red tail. The immature bird has thetail brownish gray with numerous bars. The large size and stout 462 Field Museum of Natural History —
. The birds of Illinois and Wisconsin . Coopers Hawk. Illustrating comparative difference in size Red-shouldered Hawk. Male: Length, 19 to ; wing, to 16; tail, to 10;tarsus, to 3. Female: Length, to 24; wing, to ; tail, 9 to ;tarsus, to This is the common form of Red-tailed Hawk in Illinois and Wis-consin and breeds in both states. The adult may be easily recog-nized by its size and rufous red tail. The immature bird has thetail brownish gray with numerous bars. The large size and stout 462 Field Museum of Natural History — Zoology, Vol. Red-tailed Hawk. tarsus partly covered by feathers and the entire absence of any tingeof red on the shoulder or upper wing coverts should aid in distinguish-ing it from other eastern species. The nest is large, built in a tree, and composed of sticks, twigs,moss, and leaves. The eggs are usually three, dull white, sometimeswith a faint v/ash of pale brown and occasionally blotched and markedwith cinnamon brown. They measure about x inches. Nidification usually commences in March in this latitude, althoughnests are found in April. There is a set of 3 eggs in the Field Museumcollection taken at Grinnell, Iowa, May 3, 1893. Mr. Isaac E. Hessinforms me he has in his collection seven sets of two eggs and one ofthree eggs taken near Philo, Champaign Co., Illinois. According to Dr. H. K. Fisher, in 562 stomachs of this speciesexamined by him, 54 contained poultry or game birds ; 51, other birds;278, mice; 131, other mammals; 37, batrachians or reptiles; 47, insects;8, crawfish; i,
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