The Coliiformes are represented by a single family, Coliidae or mousebirds, with six species in two genera (Colius and Urocolius) confined to sub-Saharan Africa. 

References

Ksepka DT, and Clarke JA (2010), New fossil mousebird (Aves: Coliiformes) with feather preservation provides insight into the ecological diversity of an Eocene North American avifauna. Zool. J. Linn. Soc. 160, 685-706. (abstract)

Zelenkov NV, and Dyke GJ (2008), The fossil record and evolution of mousebirds (Aves: Coliiformes), Palaeontology 51 (6), 1403-1418. (pdf)