LL Wolf 1965 Journal Dec. 20 McLaurea called less frequently, but seemed to call longer during about. Also had several bouts with extended, several note, call. Returned to Tucson + pyg and specimens; Dec. 21 Tucson Arizona to Alameda, California. Spent morning along Santa Cruz River in San Xavier Indian Reservation to south of Tucson. Flocks of sparrows, mostly White-crowned, were throughout the mesquite areas. Desert Sparrows + Brewer's Sparrows seen at edge of mesquite + cholla areas. Here much less brush cover, especially grass + habitat much more open. Saw one Ash-throated Flycatcher (heard) in some large Poplars along river. At a vertical cut bank which had exposed roots in the bare side we watched a Rock Wren + Canyon Wren foraging. Both seem to forage in about the same manner, but Canyon Wren perhaps spends more time in root tangles + Rock Wren more time on open, bare ground. Canyon Wren giving call note at irregular, but frequent intervals. Rock Wren silent during most of one hour observation. Did not seem that either bird was reacting to presence of other except when foraging paths came close. Once Canyon Wren supplantated the Rock Wren