ML 59675


Ferruginous Pygmy-Owl (Ferruginous) -- Glaucidium brasilianum [brasilianum Group] More
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Common Ground-Dove -- Columbina passerina

Paul A Schwartz
27 Oct 1970 at 00:00

  • Venezuela
  • N of Churuguara; near Maria Diaz; near Sube y Baya)
  • 10.78   -69.45
  • 370 meters
  • Mono
    Sampling Rate
    Bit Depth
  • Electro-Voice 650
  • Parabola 91.4cm (36in)
    Equipment Note

NOTES: Neotropical Institute Cut#26.Bulk 62; Extra cutlength 8:53
203 tape.
a) 7:00 AM. Weather: Clear. Natural song. Quality: 2. Level: +5.
Then after playback. Quality: 1-2. Level: +5.
Then after more playback. Quality: 1. Level: +3. 7.5 ips. (Columbina passerina good in background in last ~ 1/2 of this recording.) (Faint print through.)
Then after still more playback; now being baited by Mimus gilvus. Quality: 1. Level: +3.
b) 7:40 AM. Weather: Fair, hazy sun. After long silence bird started to sing again (no interin playback). Quality: 1. Level: +3. 7.5 ips.
Then after more playback. (I don't know if bill snap at end is by owl or another bird.) Quality: 1. Level: +3. 3.75 ips.
c) 8:25 AM. While I was dictating the notes which are transcribed overleaf, the owl suddenly burst into "alternate song." This was the first time in all the process so far that the bird gave this song, and I think it resulted now due to arrival of the bird's mate; in any case, a second owl had arrived. 3.75 ips.
d) I then moved about 100 m. away and tried all the jardinii playback again. Voice notes on tape (no reaction to any except the one-note succession and that only after repeated playback). Recordings here are owl's subsequent vocal reaction. Quality: 1. Level: +3. 203 tape. 7.5 ips.
e) 12:40 PM. Weather: Fair. The owls kept singing periodically through the morning after playback discontinued (~ 9:30 AM),so at 12:15 PM I repeated the playback. This is the song recorded after finishing. Note: One bird heard first; then the pair and s ome alternate song. I then repeated the playback (of jardinii "alternate"). One bird stopped singing and there was no reaction. (I was watching bird; it then flew back to where it had been singing. I then played both complete song and one-note succession and got no reaction.) Quality: 1. Level: +3.
After some delay (~ 15') played jardinii one-note succession 2x (the series) and got no reaction. Then I played its own song and before even the second phrase was complete, the owl flew in and looked about with excited head bobbing and then flew away even though I continued playing. I then played the recently recorded "duet" of this pair. They came closer but not right to me. (See Cut 13b of Saltator orenocensis.)
f) ~ 2:00 PM. [Note in margin:] "Note the extreme similarity of the two voices!" With the owl singing I again tried playback, leaving one recorder focused on the owl. The recording begins with the field tape sound, then continues with the owl; then field notes with regard to playback observations, at new location I found that bird reacted best to jardinii one-note succession if I delayed some time before playing it, rather than playing it immediately after playing the jardinii complete song.
About 15 minutes after previous playback and I tried again playing the one-note succession song of jardinii and got no reaction (now ~ 9:00 AM); then after several minutes delay tried playing the bird's own song and got an immediate reaction. But then a second playback of its own song brought no reaction (bird habituating?); however, I then played the brasilianum alternate song (part c of this cut) and bird reacted immediately.. Note the extreme similarity of the two voices! Quality: 1. Level: 0. 3.75 ips.
Notes after 12:15 PM playback: No reaction to jardinii alternate song played through 2x. Then played complete song 2x and got no reaction. Then played jardinii one-note succerssion and was not aware of any reaction. Then I played the recording of this owl and immediately the owl came in and perched beside me and in two or three minutes started singing; after ~ 10 phrases I recorded it and this is the recording of part e).
Note of 2:00 PM - Playback of jardinii alternate caussed owl to stop singing briefly but it soon resumed, apparently on same perch. With playback of the complete jardinii song the owl definitely stopped singing but I didn't see it come in (it apparently remained on same perch). then I played the one-note succession portions only of the complete jardinii song; after the second compmlete playing had ceased the owl again started to sing (see part f).
The tape with the field notes describing the interesting eusuing events is filed on the end of part f).
Observations of playback experiment of recordings of Glaucidium jardinii to the G. brasilianum of Cut 26).
a) First played 2x through (=10 repetitions) the first half of the G. jardinii song (i.e. the part without the typical "pygmy owl" song). This brought no reaction (although before it had been flying to and fro in reaction to playback of its own song.
b) Then played 2x through (10 repetitions) the complete jardinii song which included the typical one-note succession. Again, no reaction.
c) Then played the one-note succession of jardinii (given above by the bird, without the alternate song typical of its species). This brought immediate reaction, the brasilianum flying right over with the start of the second "phrase." (There are four such "phrases" on the jardinii field tape.)
d) Then repeated the entire process (= a), b), c)): 1) no reaction to alternate song above; 2) at very end of the section with complete song, the owl flew over, apparently slightly interested, mostly by the one-note succession portion of the song; the last part (slightly slower one-note succession above) brought immediate reaction again.
e) Then, with bird in sight, I repeated process: It showed interest to extent of looking around when I played alternate song alone. When complete song played, it showed some interest by looking around during the one-note succession portions of song. When the one-note succession above (= c) was played, the owl immediately started flying back and forth (just as had done in reaction to playback of its own song).

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