ML 59934

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Striped Owl -- Asio clamator More
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Paul A Schwartz
19 Aug 1965 at 05:15

    Geography
  • Venezuela
    Aragua
    Locality
  • Ocumare de la Costa
    Latitude/Longitude
  • 10.4666667   -67.7666667
    Elevation
  • 40 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 # 4. Bulk reel: 71.
"Weak screams." These are quite different in type and quality from the full screams of previous owls. Quality: 1. Level: +5. 138 tape.
I had on various occasions, both near El Limon and in the open country near Ocumare de la Costa, heard a barking sound that seemed certainly to be given by some owls. In the pre-dawn of 17/VIII/65, I heard these "barks" from two birds at some distance across the fields at the northern end of the Variante Ocumare. As they are given very infrequently and unpredictably I had never been able to record them and so tried a vocal imitation. After some time I heard from a tree nearby some "weak screams" which I recorded (Cut 4). As the only sounds I knew from Asio clamator were the full screams of Cuts 1/3, I didnÕt think it was this species and guessed it might be A. flammeus. Although the bird responded to playback of these weak screams, I could never see it.
2/IX. I again tried playback in the same place, after waiting from 6:30 to 9:00 PM without hearing any natural sounds. See Cut #5 for results and comments.
During several weeks I tried playback in many places from El Limon to Guaritos and the Variante Ocumare. Most times there was no reaction but occasionally I heard a "series bark" that seemed certain to be a reaction and in one case drew "weak screams" that were unquestionably a reaction (see Cut 6).
As a result of many observations, it seems that the "series barks" indicate possible coflict situations and correspond to the "conflict screams" of Otus choliba. They seem to be heard mostly at dusk and again after ~ 3:00 AM to dawn and in this latter period is when I most seem to hear too the "weak screams."
I heard "weak screams" which I recorded (Cut 8) and by repeated and insistent playback came to the definite conclusion that the same owl that gives them also gives the "series barks," confirming my impression in that regard from Cut 5. I also saw the owl giving the "weak screams" and identified it beyond doubt as R. clamator.
9/10/65. By playing "weak screams" I drew similar reaction (not recorded) and then the owl alighted near to me, gave "weak screams," then a "series bark," (not recorded), then continued with more "weak screams." I collected that individual in the last phase while "screaming" and it proved to be a male A. clamator.

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