1523 when I went over to him and poked him with a finger, but would not budge. They remained thus for several minutes, then O re- sumed his digging at the outside of the cage foundation and C again retired to the cage. Okii now proceeded to dig along the west end of the cage, then along the outside north wall, a task consuming about two hours. It was about an hour before Chiisai decided to come out and undermine the west wall. It was another hour before he discover- ed that the pine tree overhead extended upward and the earth con- sisted of something else than a mathematical plane. This required investigation, so he flew to my shoulder and from there to the lower branches of the pine, gradually climbing higher and devoting himself wholeheartedly to staring at the wonders of the world: cities and seas, spread out below him. No doubt he was impressed. He had never seen anything like it before. A few minutes of this and he sailed down to a maple in the valley below and I looked up Okii. He had finished the back wall and was now making progress down the east wall where I met him. He was glad to have a worm or two from me. The earth was still flat for him and he had never known how much of it there was that needed to be dug up. He was getting results too. Finally, after working hard about the roots of a large acacia that overhangs the cage, he observed that, in this world, there were things not held down by roofs, so up he went and disappeared in the thick foliage, where I saw and heard nothing from him for a long time. Now, after three hours, there was nothing but an empty cage and no signs of a thrasher anywhere. I went to the north fence and called toward the maple. Soon the leaves began to move and a thrasher sailed down and worked his way up toward me through the baccharis. As it approached it began to make the baby yip call and Chiisai climbed over the fence to get worms from me, thereafter following me to the cage and entering of his own free will ahead of me. About 5:45 continuous, loudscrapping was heard near the cage to the east and a thrasher flew from tree to tree, Chiisai answering from the cage. Okii then came to the cage and tried to get in through the roof. He and Chiisai now tapped the window glass opposite each other. Chiisai now came out and joined Okii on the roof and they "talked" silently to each other face to face. Okii now came in and he yipped for attention. While giving it, Chiisai disappeared, but I located him when he now began to yip, and he followed me into the cage. I shut them in for the night and saw that the roof was com- pletely covered to exclude possibility of disturbance from above. They will be released again in the morning. Sept. 27th. At 7:15 A.M. I opened the door of the cage (both thrashers were waiting there) and O and C came out at once: Okii to jump up to my hands for worms; Chiisai to dig by the door. In a min- ute or two Okii dropped down and attacked him, pulling out a tuft of feathers (the first damage of one by the other actually seen being done). Chiisai resisted and did not retreat. Okii did not press the matter further at that time. It was noted that there had been no injury to either bird during the night. Both wandered to the lath house and dug inside, where I turned over "flats" for them to enable them to get the centipedes and other creatures und- neath. In the next ten minutes Okii attacked Chiisai twice more, but mildly, Chiisai retreating unhurriedly. An hour later they were found: Chiisai on the roof of the lath house and Okii digging inside.