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Atlapetes, Apr. 21, 1962, II

from absolutely typical Chestnut-cap habitat. Obviously single bird. Phrases all "Ta ta-zeeeeeee zeeeeeeeeee"

Then followed by burst of thin high-pitched Twitter or Wbl. Greeting???? Followed immediately by more song phrases as before. Then several jumble Twitter and song phrases. Then more song phrases alone. Then more mixture Song phrases and Twitter. This sounded as if uttered by single bird, first a song phrase, followed immediately by a Twitter. Resemblance to Blue-black Grosbeak??

7:10. Come across a single Chestnut-cap. Obviously very nervous about me. Silent. Does lots of Bowing (high position much less extreme than in my drawing of last year). With extreme CR and Thflff (at first, gradually declining later). Also lots of TF's. All extremely U-D and extremely lateral. All with Tun. (Tail somewhat fanned at all times but more so during the TF's.)


Atlapetes, I
April 22, 1962
Cerro Punta

Working at level of Cerro Punta this morning. (First site).

6:30 a.m. Single Chestnut-cap. Singing steadily. Repeating identical phrases "Ta-zeeeee-ah-ta-zeeeeeeeee" This time I can actually identify the bird, altho I can't see it well. Uttering phrases while feeding on ground. No wing movements. Little or no CR and Thflff.

The "Zeeeeeee" sounds are slightly hoarse. Does this mean they are closely related to ECN's? Does this mean that the songs of this species are at least partly hostile??? If so, their evolution is somewhat problematical!!