This Central and South American order comprises a single family, Tinamidae (tinamous), with 47 species in nine genera. Tinamous are remarkable for being the only volant birds in a group of otherwise flightless birds. However, the flying ability is very poor.
Bertelli, S., L.M. Chiappe, and G. Mayr (2014), Phylogenetic interrelationships of living and extinct Tinamidae, volant palaeognathous
birds from the New World, Zool. J. Linn. Soc. 172, 145-184. (abstract)