R.R. 5 P.M. I offered the sparrow to the road-runner again when nobody else was present. He took it at once, but dropped it in trying to get it properly arranged for swallowing. I picked it up and offered it to him again. Once more he took it and dropped it. I waited about an hour. Again he dropped it. The head, feet and feathers were removed. He accepted it, only to drop it again. A live lizard was shown him from outside the cage. He came over at once and swallowed it. Birds accepting unnatural food. I have noticed with other birds, after their confidence is gained, that they will try almost anything offered them in the way of food when it is offered in the hand, and sometimes will attempt to eat perfectly inedible objects, so offered, that they would not ordinarily consider. This suggest that once they associate an individual with food, everything he offers is assumed to come under that category. About 7:45 P.M., the Grinneills, Dr. Benson and I stood watching Nb, sitting in an acacia, in order to see the final disposition of the young for the night, when he broke into a short, rather loud, hoarse "song" two or three times. I remarked at the time that this was the first instance of such a song at this place, but this statement should be qualified, as I have heard a still shorter one before. This bird flew to the old oak, and shortly after, Brownie escorted the other one to the dorm, but did not himself go to his own roost while we were there, being presumably occupied with Nova. Youngster "sings". The question was raised as to whether young birds ever return to the nest after leaving it. Examples of such return on the part of the thrashers at this place were cited, and in addition, it was pointed out that, this morning, in the presence of the Sampsons, Dr. Reyn- olds and myself, one of the two young robins in the nest outside the window by the stairs flew off with loud cries when the window was opened, and that two hours afterwards he was back in it and was still there at 7:30 P.M. (See later). Regarding young birds' return to nests. (a) Thrashers. (b) Robins. July 9th. At 7:30 A.M. this young robin was still in the nest. At 9:30 he had left. He differs radically in head marking from the one that is left, looking more like a varied thrush. 10:45 A.M. Earlier in the morning as I was filling the dish in the glade with sust-scratch feed mixture, Brownie came and took some of it, remarking softly: