Paul A Schwartz
14 Mar 1968
- Rio Caura; Cano La Urbana, + 1 km
- 7.6333333 -64.8833333
- 30 meters
- NAGRA III
- Electro-Voice 650
- Parabola 91.4cm (36in)
NOTES: Neotropical Institute Cut # 30. Bulk reel: 51
Some natural vocalizations, obtained incidentally while recording Caprimulgus nigrescens (the "pit" calls). Note one near "bother" call. Quality: 3. Level: +14.
There has been less natural song during the March trip to Rio Grande and Cano La Urbana than there had been in those places in Nov. '67 and Jan. '68. It was heard occasionally but not for prolonged periods. However, it was nevertheless less still easy to call up birds by whistled imitation or playback of field tape. Other owls too were generally inactive vocally although occasionally heard. Pulsatrix perspicillata was the only one really active. Nyctibus griseus and N. grandis were active although not profusely so.
A bird whistled up @ ~ km 11 (Rio Grande), 6/IV/68, was seen to have the irises light orangish-brown (dark tan) and the underparts appeared to be of the light-colored type.
2/VII/68 - Rio Grande, 1 km N of km 9.5. 11:30 PM to 12:30 PM, moon already set. Bird had been singing naturally normally [sic] for long while earlier in the evening.
Played field tape of O. guatemalae; no reaction.
Waited 10 min. and played O. "notes" from Perija; no reaction.
Waited 5-10 min. and played O. "watsonii" from Venezuela; after a short while I got song reaction from two birds, one with a lower voice, one with higher voice. PAS
9VII/68 - Cano La Urbana - clear, full moon.
I noticed no O. watsonii in song (did not try any playback), during the whole moon-lit night, 9:30 to 11:00 AM. [sic]
10/VII/68 - Only one bird with a bit of natural song heard during whole night.