Paul A Schwartz
8 Jun 1973
- Rancho Grande; km 13.5
- 10.3666667 -67.6833333
- 800 meters
- NAGRA UNSPECIFIED IV
- Sennheiser MKH 405
- Parabola 91.4cm (36in)
NOTES: Neotropical Institute Cut # 26. Bulk reel: 171
203 tape. LN.
a) Weather: Cloudy, fair.6:00 AM. Natural song. Two birds heard, both almost equally in line of focus. Quality: 1. Level: +2.
Whether this is a duet (i.e. by a pair) or a "duel" (i.e. between two competing males), I don't know. Later events suggest this was a "duel" with a male whose territory lies on the other side of the ridge and who was probably just at the edge of his territory. The less sharply focused bird sings complex (dawn type) song of long phrases while the other uses both types, but rather more frequently the simple, short phrase song. (Four-figure phrases without any "burry" (trilled) figures. However, after several playbacks and usually while playback was taking place, the bird would sometimes give phrases of four-figures, 2-3 of the figures with a very "burry" quality. Unfortunately I didn't succeed in recording any of these; by the time I'd get focused, he'd change to the other song.
After some time, another bird joined this one, presumably a female, his mate. This bird would fly back and forth with the male (presumed) in reaction to playback but never sang; only the male sang.
When part a) recording begins, the pair has been together for some time. On one occasion when the female left, then later called (similar flight call) from her new position, the male flew to join her (with flight call) and shortly began singing from that position.
b) After playback: only one bird reacted as far as I noted. This bird sings short phrases. (Four-figure phrases without any "burry" (trilled) figures.) Quality: 1. Level: +2.
c) 6:30 AM. Song, recorded "on focus" and then "off-focus" some 5-10¡. (Four-figure phrases without any "burry" (trilled) figures.) Qualilty: 1. Level: +2.
d) Weather: Cloudy. 7:15 AM. Later song session. (No further playback; bird has been silent since ~ 6:35 AM.) Quality: 1. Level: +2.
The others are four-figure without "burr." (Four-figure phrases without any "burry" (trilled) figures.)