ML 59329

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Vermiculated Screech-Owl (Foothill) -- Megascops guatemalae [napensis Group] More
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Paul A Schwartz
5 Aug 1965 at 00:00

    Geography
  • Venezuela
    Aragua
    Locality
  • Rancho Grande; km 19
    Latitude/Longitude
  • 10.3666667   -67.6833333
    Elevation
  • 950 meters
    Channels
  • Mono
    Sampling Rate
    Bit Depth
    Recorders
  • NAGRA III
    Microphones
  • Electro-Voice 650
    Accessories
  • Parabola 91.4cm (36in)
    Equipment Note

NOTES: Neotropical Institute Cut # 9. Bulk reel: 43; Extra cut(s) on bulk reel: 44; Extra cut length: 8:48 Ba)11:30 PM. When I arrived at this spot about 11:00 PM I heard a "high-voiced" bird singing up on the hillside, also some vocalizations that seemed to come from the same general area. These latter were very similar to the excited calls of O. choliba in conflict. (Later occurrences indicate that these could have been given by choliba but also that they may well have been given by guatemalae.)I then heard also from the same general area a guatemalae singing with a lower voice. I played the field tape: first a higher-voiced bird, second a lower-voiced bird, with a delay in between. There was no apparent reaction to the first. After the second the lower-voiced sang a little closer and the higher-voiced bird sang in what seemed to be the same place it had been singing. Some of this was recorded. Quality: 3. Level: +10.b) After further playback, similar results, but this time the low-voiced bird sang from much closer.c) Thereafter I played back both the high voice and the low voice from field tape, and also the newly recorded material, all many times and at different intervals. The high-voice field tape seemed to bring little or no reaction while the other two were more effective. In the course of this a third owl started singing so that there were now two high-voiced and one low-voiced birds. Of the two high-voiced birds, one had a higher and apparently weaker voice (I believe it may be a female) but by ear so far I can't be sure if the very first high-voiced bird (parts a & b) is the high-high" or the "med.-high" that now sings, but it seems to be the "med.-high." (It's also possible that both are "med-high" but different individuals.Actually the only bird to maintain constant interest and sing continuously was the low voice. The two high-voices would stop singing and apparently even leave the area but would later reappear (either one, or the other, or both). They could sometimes be brought back by playing low-voice field tape or by the newly recorded material but not by the high-voice field tape.The high-high bird would sometimes approach fairly close to the low bird. The med.-high bird never did so.The present section (c) records some of this song by the 2 & 3 birds. In the first part seem to be "high-high" and "low" and in the rest, all three, with parabola focused on "med.-high." (12:00 AM to 1:00 AM) Quality: 1-2. Level: +10.Part d) Cloudy-fair; moon out, ~ 1st phase. 1:00 AM. This is really "part" of c). The parabola is focused on "high-high" and "med.-high" is now some distance away. Note that the pitch of "high-high" is sometimes a bit lower. Quality: 2. Level: +10.Part e) 1:40 AM. Up to now all birds had been on the north side of the road. When "med.-high" left the last time, some time later and in the direction in which it seemed to leave but about 30 m. away and on the south side of the road there started to sing a bird whose voice seems to be ~ the same as "med-high." This was recorded and the bird collected. It proved to be a male of [illegible word or two words].Part f) 2:00 PM. After collecting the above bird, I was unable to arouse any with high voice. The "low" of north side was brought into song again and now there appeared another of "low" noise, this on the south side of the road. These two "lows" are recorded, focused on original "low." Quality: 1-2. Level: +10.

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