Paul A Schwartz
25 Sep 1974
- Estacion Biologica Rancho Grande
- 10.3666667 -67.6833333
- NAGRA IV-S
- Sennheiser MKH 405
- Parabola 91.4cm (36in)
NOTES: Neotropical Institute Cut #28. Bulk reel #530
EBRG captive birds
1230pm and 1300pm. Light cloudy.
a) Ensemble singing by many birds loafing in the brushy growth. The birds sang continuously from aprx. 1230pm; the part recorded at 1300pm was with exactly same focus of the parabola as for the earlier recording.
b) 1335pm. Fairly sunny. More of same but fewer birds (in different place) and more scattered.
Note re: cut 28- The profuse ensemble singing by many birds low in vegetation near the ground is very reminiscent of similar song by a pre-nesting flock, still in the lowlands, of S. luctuosa (of cut 6 of that species.) The ÒlownessÓ is probably due to the available kind of thick vegetation (the birds are mostly ÒhiddenÓ when singing); the birds of b) were in a matapolo/palm clump (which had maximum height of 0.5 meter.) Is it purely coincidence that luctuosa also is a black and white seedeater)? I have not observed this for other species or spp. Does bouvronides also do this on its non-mating grounds (which I believe may be in Amazonia)? At 1350pm there was again song at ÒfocusÓ of a) but with fewer birds singing. Note that much of this song is not well patterned (of also cut 29 a)). Is this by young birds just learning to sing; and is such the purpose of this ensemble singing? But also there is probably some singing by females, which is not well patterned (of cut 17 where my L. green female sings; she sang mostly in accompaniment of male R. yellow).