P. DeBenedetti 1967 June 6 Colorado River, Parker Dam area, Calif. Bird was rising; this performance was repeated 6 to 8 times. No snaps heard or glides seen. The bird returned to the top of the poplar and began preening. I lost it to sight for a while, and when I found it again it was preening from the low branches of some small trees, '6-7 ft from the ground, and on a 2 foot fence post. It made 20-30 coptrues while I watched, about 1/4 shot sailing most slightly down, or at the level of shrubs' peaks below the trees. The remainder were directed out prey on the ground, the bird flying to the ground and picking its food up, not apparently landing on the ground - at any rate flapping constantly; the ground was a 1-2" burn with some bare ground nearby. After the first song heard no vocalizations from this bird. While I was watching the bird Gray came back and said he had found 3 singing males, describing an aerial flight song with this same call and a constant "butterfly flight". I went there but was only able to find one of which displayed twice, in a fairly constant, heavy (40+ mph) wind, facing into the winds. The call may have been some chial cliff as I could not hear a flexible 'pi' note at the beginning of the call although this easily could have been observed by the wind. The bird was perched on a telephone wire and took off as if preening, then the primaries were spread and flapped more slowly, but evenly constantly during the performance. Here crest and all (all the red) body feathers were emuted,