ML 60724


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Paul A Schwartz
12 May 1973 at 06:30

  • Venezuela
  • Rancho Grande; km 15 new
  • 10.3666667   -67.6833333
  • 760 meters
  • Mono
    Sampling Rate
    Bit Depth
  • Parabola 91.4cm (36in)
    Equipment Note

NOTES: Neotropical Institute Cut #1 Mixed Colony. Song by male angustifrons in focus and male decumanus out of focus. Then some alarm calls caused practically all the oropendulas and other birds in the tree to take off suddenly. Then birds return; calls of both spp. are heard (birds apparently uneasy about my presence, esp. the decumanus). Then song by male angustifrons. Song by decumanus; the male angustifrons [illegible word] left. The decumanus then leaves. Male angustifrons is back: song (I'm no in a different position which disturbs the birds a little less). Then the male decumanus is heard to arrive; [illegible word] the flight sound, one hears a "hiss" given by the bird. The male angustifrons leaves and male decumanus sings then leaves. Note that decumanus male uses pronounced wing rattling as part of its diplay. P. angustifrons male does not use wing rattling. 6:55 AM Now both males are present and sing; the male angusifrons song is different from previously and during the course of this session he changes the pattern again. Also during this time the male decumanus left. then returned again but was silent most of the time (sang once, not recorded) and then left again. ~7:15AM. --- (Spacer) ---- 8:00AM Male decumanus sings. (Song by Platycichla [Turdus] flavipes male who [illegible word] his mate building nest) After some silence the male flew from a branch to the side of a nest (app. saw the, or a, female approaching) and produced the "hissing" noise, preceded by some mild wing rustling but **not** followed by song. A bit later he sings. Then he left, then came back w/ a female; the succeeding song is different. (the decumanus male pays no attention to arriving angustifrons females) Calls by decumanus then song: note the song phrases are quickly repeated and also are of two different kinds. (This resulted when 2 [illegible symbols] decumanus arrived together) Again the male decumanus gives the "hissing" sound (app proceeded by mild wing rustle, altho I *could not see* any wing movement); this seems to be produced from the [illegible word]. Also songs heard and then another "hiss" display. Then more song by male sitting next to a female who has nest material but won't go to the nest. Some excited calls, motive or reason undetermined.

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