Cinereous Tinamou
Crypturellus cinereus
The cinereous tinamou is a shy and secretive bird. It is approximately 29–32 cm (11–13 in) in length, and the male bird weighs around 435 grams (15.3 oz) and the female of the species weighs 549–602 grams (19.4–21.2 oz). It is colored similar to the Berlepsch's tinamou in that it is dark brown to sooty brown or brownish black in coloration. It tends to be slightly more brown than the Berlepsch's tinamou. It is recognized by its smoky-grey with reddish-brown crown and nape. The feather shafts on side of its head are white, which shows through on occasion.
ID text from Wikipedia, CC BY-SA 4.0
Undulated Tinamou
Crypturellus undulatus
The undulated tinamou is about 28–30 cm (11.0–11.8 in) in length, and weighs around 300 g (0.66 lb). Depending on subspecies, it is overall brownish tinged grey to various extents, and has a strong, black, barred to faint vermiculated pattern on the back and neck (for example, while C. u. undulatus is relatively rich brown and strongly barred, C. u. yapura is darker, more grey-tinged, and only has faint vermiculations). It has a whitish throat, and the remainders of its underparts are olive-grey to buff with dark vermiculation on its lower flanks and vent.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Cinereous Tinamou and Undulated Tinamou.