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[[circled]] 76 [[/circled]] sing because some of the local species (Diglona spp, BYB's, Blue & Blacks, [[underlined]] Basileuterus [[/underlined]] spp.) occur in mixed flocks in many other areas. Possibly the birds were less active than usual today because of the very cold and windy weather??? Possibly the apparent absence of mixed flocks here is evidence that such flocks are formed only when populations are dense??? Possibly the apparent absence of mixed flocks is correlated with breeding??? [[right margin in red]] Coer Albi[[/right margin in red]] Certainly the Coer(s) and Albis here are singing frequently enough to suggest that they are in, or near, breeding condition. And I saw one pair of [[underlined]] Tiaris olivacea [[/underlined]] perform an apparently successful copulation this morning. In any case, the behavior of the birds this morning would suggest that the formation of mixed flocks is not inevitable under frontier conditions. According to my local informants, it is full "dry" season here now. Rains stop at end of May or in June. July 18, 1965 Santa Elena Arrive one of the areas where I worked in 1962, 8300 ft, 5:25 am. Just starting to get light. Quite a lot of bird sounds. Largely Andean Sparrows, I think. Area of scattered open fields, patches second growth scrub, patches of forest. By 5:35 am, other species of birds are singing. Including [[underlined]] Tiaris [[/underlined]] and hummingbirds. But apparently no Diglossine