At the time of the hawk scare, approximately, Rhody transferred to the acacia at the sidewalk that he also affects now. He did not come down until 2:30 when Julio invited him to accept his second mouse of the day. He would not follow Julio in order to get it, but ate it when it was tossed to him. At exactly 4:37P.M. he was in his roost in the eucalyptus--perhaps a guarantee that there will be no unduly violent meteorological happenings tonight. (52°). He was already half way up the adjoining tree at 4 P.M. and it took 37 minutes to make the rest of the journey (Clear, not quite calm, but not enough wind to make certain that the weather vane pointed in its direction). Dec. 22nd. (Sunrise 7:22, sunset 4:54). Heavy clouds formed during the night. At 9 A.M. Rhody still in his roost. (48). (Looks like rain. Neo not at home--no singing heard. Southeast wind). 9:45 A.M. Rhody has shifted slightly in his roost and is now back toward the wind, tail down. 10:00 Rain begins to fall lightly. A Difference in Road-runner and Thrasher Psychology. From the very beginning of my observations on these two kinds of birds I have noticed a striking difference in their behavior toward twigs, branches, straws, weed-stalks, and so forth, that interfere with their comfort or movements; but have always forgotten to make a note of it. It is especially noticeable when one of them is standing near me, in what it considers an advantageous spot, to receive food from me, and does not want to move from that exact spot. Often one of the above mentioned impediments will interfere with its movements or, at times, prick the bird through its feathers. In the case of the thrasher--all thrashers observed here-- the bird becomes impatient at once and attempts to break off or re- move and throw away, the offending object with apparent anger, becom- ing more violent in its action when the object continues to resist. The road-runner, however, endures such a state of affairs indefinitely with the utmost placidity and will even tolerate a long succession of thrusts (caused by its own movements) from such an object about the head, face and neck, without any attempt to remove the cause or avoid it by changing position. In the end it may move aside slightly, but often it remains until some other stimulus in- fluences it to go elsewhere. The road-runner is patient; the thrash- er impatient. In building nests both birds remove, or attempt to remove, interfering growth. In that they resemble each other; but again the thrasher "gets mad about it" and the roadrunner behaves philosophical- ly. Rhody goes into 10:45. So far the rain has not been enough to make a surface new house. film of moisture on leaves, but Rhody is peering out from the inside of his new house. The chilly wind can not reach him there. More Road-runner and Thrasher Comparative Psychology. In the instance of two untamed birds: Nova, for the thras thrashers, and Circe, Rhody's only know mate, for the roadrunners, we have an instance of behavior at the nest when incubating or brooding, that does not admit of generalization to any great extent on account of the few individuals concerned and the sparsity of observations. However, Nova resent- ed my approach to the nest by scolding and pecking and pulling ang- grily at surrounding objects, maintaining this behavior even when she was a dozen yards or so away from the nest. Circe would simply slip out of the nest quietly, disappear