The motmots form the sub-family Momotinae, which with the Todinae (see ToDY) form the family Momotidae of Coraciiform birds, the nearest allies being rollers (q.v.) and kingfishers (q.v.).
The Momotidae form but a small group, containing about six genera, of which the best known are: Momotus, Baryphthengus, Hylomanes, Eumomota, Aspatha and Prionorhynchus, and the number of species is very small.
They compose the family Rhamphastidae of Coraciiform birds, and are associated with the woodpeckers (Picidae) and puff-birds and jacamars (Galbulidae); their nearest allies perhaps exist among the Capitonidae, but none of these is believed to have the long feather-like tongue which is so characteristic of the toucans, and is, so far as known, possessed besides only by the Momotidae (see MoTMOT).