As part of a study of Ferruginous Hawk behavior and ecology in southern Idaho and northern Utah, 105 juveniles were color marked with green, blue, red, orange, yellow, and white wing tags. Some markers are a solid color, others are combinations of two colors. Some birds have two markers while others have only one. In most cases there is a marker on both wings. The marker, a crescent shaped band of colored fabric, fits over the inside of the wing and is visible from both the top and bottom sides of a bird in flight, and the top side of a perched bird. Observers are requested to report the color of marker on left or right wing or both and the date and location of observation to Leon R. Powers or Dr. Charles Trost, Department of Biology, Idaho State University, Pocatello, Idaho 83201 or to Richard Howard, Wildlife Science Department, Utah State University, Logan, Utah 84322. If a marked bird is found dead, include if possible the cause of death and the band and color markers.