Otus asio Aug. 22 1 mi. WNW Schoolhouse Creek, 2300 ft., Humboldt Co., Calif. 10:00 am. As I was attempting to imitate an owl to call up some birds from the brush, I was answered 3 times by a low, faint call which approached the regular tremolo pattern of this species. Closer investigation brought silence, but I found a hollow Barry oak stub with owl feathers and a few old pellets lying about the base. I could rouse nothing from the stub. The location is just within the belt of Barry oak below the large prairie which extends from here on to NW & SE, and above the Douglas Fir forest. The calls & the hollow tree were on a flat "knoll" or an otherwise steep SW facing slope. 7:15 pm at the same spot, after 1/2 hr. or so of waiting and calling & squeaking in vain, I finally had an owl in the lower branches of a large oak. Upon collection it proved to be a juvenile (= ?) still in soft, downy body feathers. It flew from perch to perch within the oak canopy (of several trees) calling a querulous "whzee-u" occasionally, I scolded me with a grating note. Just as I shot it, another owl, presumably of this species flew past. A few minutes later one was heard giving a low tremolo call and the "whzee-u" note alternately; but I could not locate the bird. Aug. 26 (evening) 3 mi. N Willow Creek, 700 ft., Humboldt Co., Calif. One heard calling from within branchwork of maple-alder forest in bottom of Iron Creek canyon.