ML 71723

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Dull-colored Grassquit -- Tiaris obscurus More
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Natural
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song

 

 

Paul A Schwartz
20 Sep 1974 at 00:00

    Geography
  • Venezuela
    Aragua
    Locality
  • Rancho Grande; km 9 new
    Latitude/Longitude
  • 10.3666667   -67.6833333
    Elevation
  • 550 meters
    Channels
  • Mono
    Sampling Rate
    Bit Depth
    Recorders
  • NAGRA UNSPECIFIED IV
    Microphones
  • Sennheiser MKH 405
    Accessories
  • Parabola 91.4cm (36in)
    Equipment Note

NOTES: Neotropical Institute Cut #33. Bulk reel #514. 203 tape. a) 6:15 AM. Weather: Light cloudy. Natural song (two phrases). At this time I suspected this to be R. yellow but hadn't yet seen the band. Quality: 2+. Level: +3. b) 6:50 AM. After playback of above (to which bird reacted in typical fashion, coming in with a flutter-flight and using this flight also when changing perches in reaction to further playback). Quality: 1-2, "1" (slight background hiss). Level: +3. 7.5 & 15 ips. LN. I could now see the band clearly. In bird's first reaction it flew to same perch where a) was recorded. Bird is in essentially same territory as two years ago and last year (cf. Cut 32). (Cf. Cut 30.)
7:00 AM. (Not 8:00!). Last part was recorded after bird had gone down to forage for ~ 10 minutes and then returned to sing and preen; there had been no further playback.
During this bird's first flights in reaction to playback, another bird followed after it. Also, when it was foraging, another bird was with it. Presumably this other bird was its mate, a female, and I noticed an evident difference between the two: the male was slightly more dusky and the female more brownish.
Additional note: ~50 m. up the road I found another pair, one of which was gathering short bits of dried grass and taking them to a nest. The other bird accompanied this one, both during gathering and to the nest, although it didn't always go to the immediate vicinity of the nest.
20 Sept 1974. 7:15 AM. Contrary to usual behavior. there was no song, as I couldn't tell which was the male. Because the nest was nearly finished, as nearly as I could see (these fine bits of grass were apparently for lining), I imagine it was the female who was now buildling. The presumed male did no gathering of material nor building.
In this pair there is no obvious difference, both being brownish like the presumed female of Cut 33). Perhaps this is a young male.

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