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Nesting of the Fulvous-breasted Flatbill (Rhynchocyclus fulvipectus) in 
Southeastern Peru 
David Ocampo 1 * - 4 and Gustavo A. Londoner 3 
ABSTRACT.—The Fulvous-breasted Flatbill 
{Rhynchocyclus fulvipectus) has an Andean distribution 
from Colombia and Venezuela to northeastern Bolivia 
between 750 and 2.300 m elevation. We describe (he 
nesting behavior, nest. eggs, and nestlings of this 
species in the buffer zone of Manu National Park at 
Cock of the Rock Field Station, Cusco, Peru, from 
August through December 2009. We monitored seven 
nests using data loggers to describe incubation patterns 
and conducted direct observations of provisioning 
behavior. The two-egg clutch size and pear-shaped nesi 
structure were consistent with previous reports. Incu¬ 
bation lasted 24 days (n — I) and nestlings were in the 
nest for at least 29 days. We only observed one parent 
1 Institute dc Biologia, Universidad de Antioquia. 
A.A.1226, MedcIIin-Colombia. 
"Florida Museum of Natural History, Dickinson Hall. 
University of Florida, Gainesville. FL 32611, USA 
’Department of Biology, 227 Bartram Hall. University of 
londa, P. O. Box 118525, Gainesville, FL 32611, USA. 
Corresponding author; e-mail: algorab2@gmail.com 
incubating (presumably the female) with average nest 
attentiveness of 64%. which decreased as the incubation 
period progressed. The adult made 10 to 15 foraging 
trips per day (n - 21) during incubation, when it spent 
on average (±SD) 32.9 ± 2.8 min during incubation 
bouts and 23.1 ± 6.3 min during foraging bouts (n = - 
nests). Nestlings were able to regulate their bod) 
temperature after the feathers were fully developed; 
however, their body temperature (37 C) was lower 
compared to adults. We confirmed Rhynchocyclus nest' 
exclusively along creeks or rivers and also revealed 
long incubation and nestling periods, which may be 
more common than expected in tropical mountain areas 
There was a decrease in nest attentiveness through time, 
contradicting previous findings on neotropical passerine 
species. Received 27 September 2010. Accepted 27 
February 2011. 
The genus Rhynchocyclus encompasses four 
species distributed from southern Mexico to 
northeastern Bolivia, eastern Venezuela, and 
