Paul A Schwartz
23 Mar 1975
- Catatumbo region
- 9.35 -71.75
- 60 meters
- NAGRA UNSPECIFIED IV
- Sennheiser MKH 405
- Parabola 91.4cm (36in)
NOTES: Neotropical Institute Cut #Z-9. Bulk reel #497
Song type 1 = SO-SOO-la; 2 = SO-SO-LA; 3 = SO-LAA.
See comments following Cut Z-8. 23 March I was in the woods where I'd found the number of birds the preceding afternoon from dawn (6:00 AM) to 10:00 AM; cloudy early but sun out from ~8:30 AM. No song heard from this species (a little by C. soui). I tried no whistled imitation as I wanted to learn the natural state of this population at this time. Rest of day was fair to clear and although I checked the area several times, heard no Soisola song. Therefore I whistled imitations from 5:20 to 5:30 PM but up to 6:00 PM I still heard no Soisola. Therefore I began whistled imitation again. At ~6:05 one bird was heard to give two or three phrases, either distantly or quietly, but no others until ~6:20 PM when a number of birds came into song, seemingly even more than yesterday: one male [type]1 at west end of woods and north of trail; one male(?) [type] 3, apparently same as yesterday but now ~150 m. to east and then "east of woods"; one male [type]1, apparently same as yesterday but now ~100 m. east and then "east of woods" (on south side); one or two females associated with the second [type] 1 male, and two or three others apparently at some distance to east on south and north sides or else closer than they seemed but singing quietly.
24 March - No soisolas were heard in the early morning up to ~ 8:00 AM; weather fair to clear. I returned to area @ ~9:15 AM and heard none. I entered the woods at west end and north of trail to close to the position w[h]ere bird of Cut Z-9, a [blank] had been recorded and began whistling all kinds of phrases but mostly types 1 & 2, or of the two females that had been on the north side. After ~ 15 minutes, a type 1 bird did begin singing at weest end of woods but to south of trail. Unfortunately, I had no recording equipment with me and as more specimens were desirable, I went to south trail and began whistling again. Although the bird had become silent and did not resume song, after ~ 10 minutes I saw a bird approaching and collected it. I had thought this was probably the bird of Z-9, a [blank], but in the latel PM (no soisolas heard all rest of day) the bird from east end and "east of woods" did not sing and so the collected bird may have been that one. In fact, it was at least 6:25 PM (I was at area by 6:10 PM) before any birds sang. When up to 6:20 PM none had sung, I began whistled imitation and then subsequently heard mainly only the bird of Cut Z-10. I have no explanation for the lack of song except possibly that most of the other birds were females and the elimination of the male (actually two males, counting the first bird collected, which was really very close to this area when collected) caused the females to become quiet. Perhaps the birds would not have sung at all today if I had not whistled the imitations.
a) Type 1; bird at west end of woods and on north side of trail. Quality: 1-2. Level: +3. 139 tape. 3.75 ips. Std.
b) Type 1; bird "east of woods" on south side of trails. (The bird heard in background of a) is probably this bird although the type 3 of cut Z-10 is also heard.) Quality: 2 to 1-. Level: +3. 3.75 ips. Std.
In the present part b), several birds heard in background: type 3 of Cut Z-10), type 1 (another [type] 1 male?) of part a) and apparently a couple females. Quality: 1-2. Level: +3. 7.5 ips. Std.