Twining 1935 Salmon Creek Reservoir, 4 mi w. Riggsor- Twin Falls Co. Idaho. May 13, 1935 Both Hens were mounted, in pairs, at regular intervals. Their actions suggested nesting in the talus close to the water. A pair of Red Tailed Hawks circling above the cliffs on the opposite side of the lake occasionally screaming and diving indicated a nest somewhere on the high cliffs on that side. May 14, 1935. Aldrich and Davis trapped last night so this was my day in the field. Crossed the dam and found a Marmot inhabited talus slope discovered by Aldrich the day before. I hit a big adult with no. 9 shot-16ga. but he got down deep into the rocks before I could get him. I found a Red Tailed Hawk very much disturbed over my presence on the rim of the canyon about 300 yds. below the dam. He lit on a ledge very high on the vertical cliff after a long sweeping dive with wings half closed, and stood there screaming for several minutes. Careful examination of the ledge disclosed a few sticks so this was probably the nest. Cliff and Violet Green Swallows were both nesting on the face of the cliff, and Prairie Falcons swooping and diving on the other side were also probably nesting. The most common bird in the canyon bottom as well as the most conspicuous is Yellow Warbler. The song was almost continuously heard. Several Flycatchers were found feeding from the upper branches of the scattered Utah Junipers