J. Groth 1987 journal 173. Spring Creek Pass, elev. 11,000 ft San Juan Mts., Hinsdale Co., Colorado June 5 (cont'd) yesterday, with some fairly large (10-20 birds) flocks of type 2's -- all apparently adults. Type 4's flew in groups of 5-8, with stripy birds evident: a group of 3 juvenile Type 4's came into the campsite. Type 5's were common, but never in large groups (largest = 5, but mostly single birds). I saw one group of Type 5's with juveniles. White-winged crossbills were the least common, with singles, pairs, and groups of 3. The pine siskins here were very common and active. The males were in song. The song contained imitated elements of pine grosbeak, evening grosbeak, red crossbill, Type 4 white-winged crossbill. The pine grosbeak had an interesting song: the usual warble, plus an imitated "three-beers" just like an olive-sided flycatcher (also here, greeting down in the valley.) Other birds around: junco, hermit thrush, robin, gray jay, raven (active), mountain