K.Dixon 1949 Sitta canadensis Apr. 8. Univ. Calif. Campus, Berkeley, Alameda Co., Calif. Clear mild day, 1:00 PM. Heard 'enk enk enk' call several times from branch of eucalyptus free about 20 feet overhead - (tree at NW entrance of Life Sciences Bldg). Bob Rudd and I located bird which had stopped calling and was charching at an angle about 45° from the vertical taking mouthfuls of wood out of dead portion of horizontal branch. Excavation was such that bird could insert entire head into the cavity. The bird ceased digging after several minutes, flew to another branch, called 'enk enk enk', and flew across the stream to N, continuing to call from another perch there. From the light color of breast, I'd judge this bird to be ♀. No evidence of male in vicinity.