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Mixed Diglossini, May 18, 1965, II. (45) appreciable distance. Did not actually attack. I couldn't tell if following was coincidental or not. Scan eventually stopped following and performed display flight (which may be territorial and/or hostile). ^[[Scan]] Scans still vocalizing and displaying vigorously 7:33. They would appear to be in breeding condition here now! ^[[Ater 205]] 7:35. Single ^[[checkmark]] Ater perches exposed, 4 ft up, and utters several Song phrases. Rapid Twitters. NOD. ^[[Ater CC]] Songs of Aters and CC's seem to be as similar here as in Quito region 7:40. Same Ater back same place. Singing as before. Then shuts up. And suddenly performs extreme TV. Apparently, there is another bird around somewhere. But I don't see it. Then the Ater relaxes ^[[Ater]] Eventually flies off [[image - drawing of a bird silhouette, tail up, undertail ruffled]] Are there Aters coming in to breeding condition? ^[[Scan]] Sing postures of the bird apparently unritualized. No belly-fluffing. Scans seem to be [[underlined]] ignoring [[/underlined]] Passifloras. (I [[underlined]] think [[/underlined]] this may be true throughout the Andes. ^[[Ater]] Same Ater back Singing again same place. As far as I can tell (above the roar of nearby torrent) phrases are without R component. Certainly all phrases are very short. ^[[Ater 206]] One Ater ^[[checkmark]] chases the other furiously. Chase is prolonged. Then one comes back and Sings in usual place. ^[[Ater]] Territory of Ater here is very large. At least [[underlined]] 500 [[/underlined]] ft one direction, 200 ft in the other. Population cannot be dense here.