Bush-Tit Mayhew 1947 Mar. 8 Strawberry Canyon, U.C. campus, Alameda Co., Calif. At 8:20 A.M. four members of this species were seen and heard just north of the stadium in a small oak tree. Shortly 2 of them flew off together, which seems to signify that the winter flocks are breaking up & the individuals pairing up. They uttered their light call notes as they passed through the tree. The nest of one of the pairs was found in a small oak about 10' above the ground. It was only partially completed. The site was in the leafy part of the foliage toward the end of the branch. At 8:38 A.M. one bird arrived at the nest, where it remained but a few seconds, adding a bit of material to the nest. All the while, it uttered its little chirping note. The other bird approached to about 20' of the nest, but departed when the other bird left the nest area. At 8:44 A.M. both birds arrived with material for the nest. The first bird was at the nest 20 seconds, and when it flew to a near-by tree, the second bird flew to the nest & stayed for 25 seconds. It then joined the other bird in the near-by oak from which both departed. At 8:46 they returned with oak catkins for the nest, but were alarmed before they could deposit the material. At 8:48 A.M. they both arrived at the nest again & both deposited the material. They spent 25 seconds at the nest, and then one of them returned with another load 20 seconds later. At 8:54 A.M. they returned with another load, landing first in the near-by tree, then flew to the nest. It remained at the