The Trogons differ from all other birds in the structure of the feet. The first and second digits are turned backwards, and are supplied by the flexor longus hallucis, and the third and fourth digits are directed forward and connected with the flexor perforans digitorum. The two flexor tendons are united by a vinculum (fig. 58).
Palate schizognathous (Forbes, P. Z. S. 1881, p. 836). Basipterygoid processes are present. Sternum with four notches on the posterior border ; manubrium long, slightly forked ; coracoids in contact. Oil-gland nude. Caeca present. Spinal feather-tract well-defined from nape to oil-gland, not forked. Aftershaft of contour-feathers large. No median wing-coverts. Ambiens muscle wanting. Plumage of the young nearly resembling that of ±he female.
A single family.