Spix's Guan
Penelope jacquacu
The four subspecies of Spix's guan differ in weight and plumage, and there are intergrades between them. Their length is 66–76 cm (26–30 in). The male and female nominate P. j. jacquacu weigh 1.24–1.36 kg (2.7–3.0 lb) and 1.14 kg (2.5 lb) respectively. The male P. j. orienticola weighs 1.40–1.78 kg (3.1–3.9 lb) and the female 1.27–1.72 kg (2.8–3.8 lb). The nominate subspecies is bronzy olive green above and bright reddish below. "Grant's" is much darker; the upper parts have a blue-green gloss and the red underside is dark. P. j.
ID text from Wikipedia, CC BY-SA 4.0
Yungas Guan
Penelope bridgesi
Male and female Yungas guans are alike. They are chestnut above and dull reddish brown below. The belly has brown to orange horizontal markings and the tail is dark brown. The head and back of the neck are black. Feathers of the neck, back, and chest have white edges that are significantly larger than those of P. obscura. The bare skin of the face is slate gray and the wattle is red. The Yungas guan is larger than P. obscura; the lengths of nine specimens were between 77.0 cm (30.3 in) and 89.0 cm (35.0 in) compared to 48.0 cm (18.9 in) and 66.0 cm (26.0 in) for two specimens of P. obscura.
ID text from Wikipedia, CC BY-SA 4.0
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