Mayhew 1947 May 23 Western Robin U.C. campus, Alameda Co., Calif. with feather primordia (at least, all of their bodies that I could see). My animal in the tree didn't affect them in the slightest. Even when I tapped on the nest, they completely ignored me. At 6:27 A.M. the ? arrived at the nest & stood on the west edge, from where she fed one youngster. Then she settled down on the nest facing north-east. At 6:32 A.M. the ? flew directly to the edge of the nest, whereupon the ? beat a hasty retreat. The ? fed two youngsters & departed. At 6:35 A.M. the ? returned, fed one youngster, & flew away to the north-west. At 6:39 A.M. the ? returned, fed one youngster, than settled down on the nest facing east. At 6:40 A.M. a ? House Finch landed on a branch about 4 feet from the nest, but could cause no response in the ? Robin. At 6:45 A.M. the ? left the nest flying north- west. At 6:55 A.M. two half-grown Robins were seen feeding on the lawn. They looked very similar to full grown Robins, except that their breasts were much lighter, & speckled with dark spots. I was able to approach within 4 feet of one of them before it flew. At 6:59 A.M. the ? returned from the north- west. She landed on a branch about 3 feet from the nest, then on a branch a foot from the nest, then on the west edge of the 27.