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THE WILSON JOURNAL OF ORNITHOLOGY • Vol 123. No. 3. September 2011 
(A) 
■■■ 
• ■ 
A 
• Nestling one - nest one 
^ Nestling two - nest one 
■ Nestling one - nest two 
10 12 14 16 18 20 22 24 
26 28 30 
0 
-1 
-2 1 
(B) 
t A 
A A 
14 16 
Days 
18 20 22 24 26 28 
of three nestisfromTwo dtfferln^ ° f ' he Fu 'vou S -breasted Flatbill. (A) Mass increme, 
square corresponds to the single nestling from the second nes, ‘° ,W ° nestlin ^ s from the firs ' nestand ’' 
penod after exposing „e Stl i„gs environ,nen,a, ,e mp e ra ,„ re for 3 th ' 
GAL. unpubl. data), and 6 days longer than the 
partial period reported for this species by Greeney 
et al. (2004). The nestling period was also lone 
but similar to the 27 days reported by Greeney et 
al. (2004). Nest location was also similar to 
previous studies: over small creeks inside the 
orest and attached to branches and epiphytes 
etween 3 and 12 m high (Parker and Parker 198^ 
ah 20 ° 4 ' Bmmtleld MailJard 
2007). Nest materials, location, and shape are 
^ hoc y cll4S species (Fitzpatrick 
al. 2004), those described for the sister group 
(Tolmomyias spp.) were classified as a closed/ 
retort/pensile structure with a vertical/downward 
tube (Simon and Pacheco 2005). 
The clutch size in our study is consistent with 
that previously reported for 7?. fulvipectus and other 
species of this genus (1-3 eggs; Parker and Parker 
1982. Fitzpatrick et al. 2004. Greeney et al, 2004. 
Brumfield and Mailiard 2007). Nestling body mass 
when fully feathered was 4 g higher than the 
reported adult mass (23.1 g) (Dunning 2008). 
The nestling was able to regulate body temper¬ 
ature after it was fully feathered, but this 
