This flappet lark is of the western form, according to “Birds of Southern Africa” by I.Sinclair, Ph.Hockey, W.Tarboton (recommended reading, by the way).

Flappet lark (Mirafra rufocinnamomea), Alouette bourdonnante.
Moremi National Park, Botswana. May 2010.
This is not a lark at all, but rather a Pipit. Looks like Buffy Pipit to me.