Rusty-margined Guan

The rusty-margined guan is 55 to 73 cm (1.8 to 2.4 ft) long. The nominate subspecies weighs 950 to 1,150 g (2.1 to 2.5 lb) and P. s. jacupemba 750 to 880 g (1.7 to 1.9 lb). The species' upperparts are dark olive to brownish with the eponymous reddish margins on the wing coverts and scapulars. The belly is also rusty. The face is pale with a supercilium whose color ranges from white to buff or ochre in the different subspecies. P. s. jacupemba paler overall than the nominate and P. s. major is darker.

The nominate subspecies of rusty-margined guan is found in Amazonian Brazil south of the Amazon River. P. s. pseudonyma when treated separately is more westerly than the nominate sensu stricto. P. s. jacupemba is found from central and southern Brazil into eastern Bolivia. P. s. major is found in extreme southeastern Brazil, eastern Paraguay, and extreme northeastern Argentina. The rusty-margined guan inhabits a wide variety of landscapes across its large range. Examples include the interior and edges of heavy forest, gallery forest, restinga, woodlands in cerrado grasslands, caatinga, mangroves, and Eucalyptus plantations. It is generally a bird of the lowlands but can be found as high as 1,300 m (4,300 ft) in parts of Brazil.

The rusty-margined guan forages alone, in pairs, or in groups of up to 10 birds. It mainly feeds between about 5 and 10 m (16 and 33 ft) above the ground, but often feeds on the ground as well. Its diet is almost entirely fruit; one study identified the fruit of 117 plant species. It also eats small amounts of flowers, leaves, and insects.