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White-browed Guan
Penelope jacucaca
Jacu, Jacucaca
This page is a supplement for the publication "Observation on White-browed Guan Penelope jacucaca in north-east Brasil", by H. Redies, 2013, Cotinga 35:61-68 OL (download), with some additional photos of P. jacucaca. To go to the main page for this species, click here.

White-browed Guan (Penelope jacucaca)
31/10/2007; Mãe-da-lua reserve, Itapajé, Ceará, Brazil. 200 mm f2.8 lens.

P01. According to Sick 1997, p. 271, the female White-browed Guan has a brown iris, and the male has a red iris. If this is correct, then the bird above is a female.

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White-browed Guan (Penelope jacucaca)
05/09/2010; Mãe-da-lua reserve, Itapajé, Ceará, Brazil. 300 mm f2.8 lens.

P02. According to Sick 1997, male White-browed Guans have a "red" iris. The bird on the photo has a reddish-brown iris. If we assume that this corresponds to Sick's "red", then the individual depicted above should be a male.

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White-browed Guan (Penelope jacucaca)
14/11/2007; Mãe-da-lua reserve, Itapajé, Ceará, Brazil. 200 mm f2.8 lens.

P03. This photo is the same as shown in fig. 3 of the main page, but in a different magnification (1:1) and side-flipped. The color of the iris appears to be intermediate between the dark brown in P01 and the reddish-brown in P02. This does not necessarily mean that there is no clear difference in iris color between male and female. The "intermediate brown" could be due to the effect of the ambient light, and the iris of this bird might look different (reddish-brown?) in other conditions. Photos made under uncontrolled light conditions are not realiable indicators of color tones. See also this instructive example.

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