Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
J.P. Myers
1974
Tryngity subbifoliis
65
Grid 17B, Tower (1,18) region, Estancia Medaland, 35 Km S. of Juancho by road,
Ptdo de Madaniang, Pcia de Bs. Aires, Argentina
22 November
cont'd
1723 - spook 1745 - buffle flew into 0,1 of 16B and immediately began a cup
display. No other bird in immediate vicinity. At end of display the bird
folded up + began preening. 1801 - 2 buffle headed downwards shooting area,
1807 in 4,4 of 16b I was watching a pair. They had come in foraging di-
rectorially. With about 100 seconds lead time I predicted a cup display, but am not sure
of my cues. Necks were stretched with feathers puffed, both birds close, both
hopping slightly but without wing out. The displacer held for several seconds. At
first, the wings were not cupped but rather straight out at an angle
[sketch of birds in sequence: beginning of cup, then birds with wings arched upward, then birds with wings fully cupped]
it then lifted wings to a more vertical position, arched its back, stuck the tail up
unfanned and pointed its bill at recipient. It kept the other bird within
the wingtips. Wing very far forward, then towards the end of the display
(perhaps last of 9 seconds), the cupping bird retracted its neck to a scrunched
position and pointed the bill up at ~60°45-60°. As this all occurred, the other
bird moved, forcing the displaying bird to move quite a bit (50cm?) in order
to keep the recipient within the cup. The displayer may have been larger
than the recipient. 1809-1814 - another cup, same pair I think. By
the way, NIDDLER 4PM (CRLA) May 2,0-16b again defending.
Just before this second cup began they stood very close facing one another
this time the displacer did not reach the final bill up part; nor was
the head retracted. It had some trouble because, facing array from the wind (which
is strong) it was blown or at least ruffled somewhat, erecting back and
head feathers. (or at least I think that was the wind). 1816 - (0,5)-16b now
supplanting the displaying bird, which looks as if it is 2,0-16b! Ran away
from 0,1-16b with tail down. recipient also supplanting. [illegible] The neck