Cogswell 1949 Accipiter cooperi Mar. 5 - Wildcat Canyon, 3/4 mi. E of Spruce St. entrance to Tollen Regional Park, Contra Costa Co., Calif. - a sharp squeaky "sbeer" or "skeek" repeated 3 or 4 times, from brushy hillside (I'm quite sure from a Cooper's Hawk) was followed immediately by calling (chi-ca-go) of several quail in the vicinity. A Cooper's Hawk was seen by several of us in the Zoology 125 class a short while before this, as it glided thru the oaks on a small ridge E of the main canyon. In the P.M. one was seen soaring over the vegetational analysis study area (open grassland to bits of riparian oak woodland). This bird had a large gap in the middle of the right wing.