STICK NESTS ON A BUILDING AND TRANSMISSION TOWERS USED FOR NESTING BYLARGE FALCONS IN UTAH

Large falcons (genus Falco) do not build their own nests and, in North America at least, usually nest on high cliffs. Occasionally they nest in abandoned stick nests built by another large bird on the cliff. In Asia and particularly South Africa, they sometimes nest in stick nest s on electrical power transmission towers. This use of electric transm ission towers was recently (1980) reported for the Prairie Falcon (Fal co mexicanus) in North America but is unknown, except for 1 anecdotica lly documented use of an ''electric-power pole'' at the turn of centur y in California, for the Peregrine Falcon (Falco peregrinus) in North America. Here we report such nesting of the peregrine in North America and additional tower nestings for the Prairie Falcon.