Aldrich 1938 [Buteo swainsoni] Swainson Hawk 2 mi. NWE Cima, 4100 ft., San Bernardino Co., Calif. May 15, 1938 This A.M. went 5 mi. W camp to nest of this species located near top of Joshua 20' tall. Nest about 3' wide at top and as deep. Lined with Joshua bark fibers. 2 eggs, white, slightly rough seemed quite far incubated. Bird flushed at my approach when I was 30yds away, flew low over trees, circled quietly around me and then sailed out of sight low over Joshua. Waited 40yds away partially camouflaged beneath Joshua & waited for her return. Waited 5hr & noticed her perching on a Joshua 50yds beyond nest tree, stayed there for 10 min constantly moving head from front position to direction of nest. While here a pair (?) of Kingbirds began attacking it and then a couple of Shrikes. This only caused her(?) to move head more rapidly. She then flew to left of nest tree 30yds chased by a Shrike (paid no attention). Perched another 5 min, always looking towards nest tree. Then took off as usual with about 4 flaps sailed in the strong wind over me displaying the