Feet usually cold. Although birds have high body temperatures, their feet do not necessarily partake of this temperature. I had just noticed how cold B's were, and this is frequently the case. Long full-song. About noon almost continuous thrasher full song was heard to the west. The bird was finally located sitting on a fence post entirely in the open about 50 feet from my west line. I think it was Brownie, although he did not respond to call. He kept this up for about a half hour, then went down into the canyon to the west, where he continued singing for a long time. While sitting on the post, each individual song lasted from 2 to 4 minutes, by watch, and the intervals between songs were of only a few seconds duration. As a partial check on the identity of the singer, Greenie was located singing under-song in the glade when the song to the west was first heard and Brownie was not to be found on the place. Object of song. If the utilitarian object of this song is to warn other males that the territory is occupied, the selection of a site from which to sing was well made, as there is good thrasher territory to the west. Mate for life? It does not seem, in the case of Brownie at least, that the object of full song is to attract a mate, for he and Greenie are now approaching together their second known nesting season, and are apparently as happy as ever. This favors the postulate that California Thrashers mate for life. B in night roost early. 5:05 P.M. Not seeing the thrashers about, I went to the dormitory tree. There was B sitting quietly in his night roost. When he saw me, he looked down at me placidly and wriggled his toes, but otherwise did nothing. As it was broad daylight, this was too early to go to bed, so I left, to return 20 minutes later. He was digging in the berry patch. After making a threatening gesture at a quail there, causing it to run away, he abandoned further work for the day and headed for his sleeping place about 5:30. (Sunset 5:31, Temp. 52).