Pterocliformes

 

Classification Structurally, sandgrouse are very close to pigeons; in fact Columbiformes, Pterocliformes and  the recently individualized Mesitornithiforme order have a common genetic ancestor.

Sandgrouse are land birds living on vegetable food and, like pigeons, all feed their young by regurgitation from a large crop. It has been contended that both pigeons and sangrouse are the only birds able to suck up water, lowering their beaks without raising their heads until they are full, but direct observation of drinking sangrouses have not confirmed that they behave like pigeons in this respect. The 16 species of Pteroclidiformes live in sandy, open, treeless country, in the drier regions of Africa, southern Europe, central and southern Asia.

http://en.wikipedia.org/wiki/Sandgrouse

Hackett SJ et al (2008): Phylogenomic Study of Birds

Austin Jr, O.L. (1961): Birds of the World, Golden Press, New York, p 140.

http://sora.unm.edu/sites/default/files/journals/auk/v083n01/p0124-p0126.pdf