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[[circled]] [[right justified]] 7 [[/right justified]] [[/circled]] nstrated one important point.there is no immediate "upsurge" of the tendency (ies) to form mixed flocks when external conditions suddenly turn very unfavorable. The behavior of most of the species this morning may also help to explain why mixed flocks are not more common (or are actually less common)during the non-breeding season then during the breeding season here in the northern Andes (assuming that conditions during the non-breeding season are less "favorable" that conditions during the breeding season – as seems reasonable). When external conditions turned bad, the birds tend to lurk, "hidden", in dense vegetation. They probably also move comparatively infrequently and apparently vocalize comparatively infrequently. All this must make them comparatively "unattractive". [[right justified]]April 21, 1965[[/right justified]] [[right justified]]Mts above Bogotá[[/right justified]] SEE TODAY'S NOTES ON MIXED DIGLOSSINI Which include descriptions of the reactions of birds to sunlight following cloud and rain, in the afternoon. [[right justified]] April 22, 1965 [[/right justified]] [[right justified]] Paramó de Guasca [[/right justified]] Arrive usual area 5:45 a.m. Cloudy. Probably going to be fog here very shortly. Going to walk along road. Quite a lot of bird noises. Thrushes. Whistle songs of Atlapetes. Others.