Cauca Guan vs Dusky-legged Guan

The Cauca Guan and Dusky-legged Guan are both medium-sized, arboreal birds found in South America, but they differ in distribution and subtle plumage details. The Cauca Guan is endemic to Colombia, while the Dusky-legged Guan is found further south in Brazil, Paraguay, Uruguay, and Argentina. Key identification features include differences in plumage and habitat preferences.

1. Location: Check the geographic range; Cauca Guan is only in Colombia. 2. Tail: Look for white-tipped tail in Cauca Guan. 3. Plumage: Note the more uniform dark plumage of Cauca Guan versus the dusky appearance of Dusky-legged Guan. 4. Behavior: Listen for wing-drumming in Dusky-legged Guan.

Both species are similar in size, typical of medium-sized guans.

The Cauca Guan has a more uniform dark plumage with a distinctive white-tipped tail, while the Dusky-legged Guan shows a more varied plumage with a dusky appearance and lacks the white tail tips.

Both species are arboreal and often found foraging in trees, sometimes in groups. The Dusky-legged Guan is noted for its flight displays with wing-drumming sounds.

The Cauca Guan is restricted to the forests of Colombia, whereas the Dusky-legged Guan inhabits a wider range across southern Brazil, Paraguay, Uruguay, and Argentina, often in montane and lowland forests.

Both species produce nonvocal sounds, but the Dusky-legged Guan is specifically noted for its wing-drumming during flight displays.