Mayhew 1947 May 28 U.C. campus, Alameda Co., Calif. execution pellet; then stood on the edge of the nest 35 seconds before flying off to the north-west. At 3:22 P.M. the ? returned to the west edge of the nest, fed one youngster, then settled on the nest facing east. Almost immediately she changed her position so that she was facing west. At 3:34 P.M. the ? stood up in the nest, probed in the bottom of the nest with her bill for about 20 seconds, then settled down on the nest again, facing west. At 3:37 P.M. the ? began to preen her breast feathers. She flew from the nest a moment later. The dr + ? are both on the gazon digging for worms about 150 feet from the tree; + and 200 feet apart. At 3:44 P.M. a Song Sparrow flew into the tree about 30 feet from the nest. By this time the ? Robin had worked back to within 40 feet of the tree. As soon as the Song Sparrow entered the tree, the ? Robin flew to the west edge of the nest, uttering 3 notes in rapid succession, even though she had no food for the young. She stood on the edge of the nest for 30 seconds, then settled upon the nest facing east. 30 seconds later she stood up + shifted her position so that she was facing west. As she settled down, she fluffed her body feathers up + down several times, looking as if