ML 59169

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Lined Forest-Falcon -- Micrastur gilvicollis More
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Natural
 

song

 

 

Paul A Schwartz
21 Feb 1972 at 06:20

    Geography
  • Venezuela
    Amazonas
    Locality
  • Rio Negro region; road San Carlos to Solan
    Latitude/Longitude
  • 2.0   -66.95
    Elevation
  • 100 meters
    Channels
  • Mono
    Sampling Rate
    Bit Depth
    Recorders
  • NAGRA UNSPECIFIED IV
    Microphones
  • Sennheiser MKH 405
    Accessories
  • Parabola 61cm (24in)
    Equipment Note

NOTES: Neotropical Institute Cut # 18. Bulk reel: 37; Extra cut(s) on bulk reel: 38; Extra cut length:
203 tape.
a) 6:20 AM. Birds (pair?) far to west of camp. Quality: 2-3. Level: +5.
Louder-voiced bird has higher pitch. It starts with two-figure phrases which speed up gradually and then include a few three-figure phrases. This bird then stops and later resumes with some rather sharp three- and four-figure phrases.
The lower-voiced bird uses two-figure phrases for long time, then gradually changes to three-figure. Later another bird, perhaps this one now closer, also gives fast phrases and very sharp.
Then after an interval while reels changed, a bird gives up to [several illegible numbers/words] phrases.
b) Now focus on a bird just to west of camp (same as in cut 17?). Quality: 2. Level: +5.
This is a different bird, nearer to me, and can be heard somewhat in background of a). It apparently started with two-figure but soon put in three-figure, too.
Now, in focus, it gives three-figure but also some two-figure, then stops three-figure, [illegible word] all two-figure phrases and does not speed up.
c) Now focus on far birds again. Quality: 3. Level: +5.
Only one bird heard surely and it uses three- and four-figure phrases which are now not as sharp as before.
d) 6:30 AM. Now focus on near birds again and now two birds (pair?) are heard. Quality: 2. Level: +5.
The near bird now gives four- (and 5-?) figure phrases which are sharper in beginning but become slower. A second bird, with lower voice, is heard in a low-intensity, multi-figure phrase song (perhaps a mild reaction type; or pair reaction?).
Note: 2 Mar 1972 - ~ 300 m. east of camp at dawn heard a pair; one with higher voice started with two-figure phrases, but quickly mixed in three-figure phrases, speeded up, and continued on, ending with four-figure. The other bird, fairly close although far from side x side, had lower voice; it began with one-figure succession, then went into two-figure succession which continued for long time, finally ending with three-figure.

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