Selina el al. • HELMETED CURASSOW DENSITY 
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FIG. 1. Geographic distribution of Helmeted Curassows. 
May, September, and October 2008 for total of 
245 days in the 17 months sampled. 
Data were collected upon each visual contact 
with a curassow. The perpendicular distance from 
the bird to the nearest point of the transect was 
measured with a standard metal tape; the meeting 
point with the bird was estimated when the 
observation was not directly perpendicular and 
walked to measure the perpendicular distance to 
the nearest point of the transect. Other data 
recorded included time of the encounter, number 
of individuals observed, and the forest stratum in 
which the bird was observed (floor, understory 
6-20 m, or canopy > 20 m). 
Data were analyzed using Distance 5.0 (Thom¬ 
as et al. 2006). Density estimates and resulting 
population estimates were obtained by selecting 
the best detection curve model based on Akaike 
Information Criterion (A1C). which is based on 
the Kullback-Lcibcr model (Akaike 1981). 
Line transects 
FIG. 2. Number of individual Hcmeted Curassows 
detected in each transect in Tama National Park. Colombia. 
FIG. 3. Pattern of detections of Helmeted Curassows in 
morning and afternoon in Tama National Park, Colombia. 
