It looks to be Hartlaub's Bustard but is a bit out of range. The next choice is Black Bellied Bustard. Only one observed
Bustards, including floricans and korhaans, are large and highly terrestrial birds mainly associated with dry open country and steppes in the Old World. They range in length from 40 to 150 cm (16 to 59 in). They make up the family Otididae (formerly known as Otidae). Bustards are omnivorous and opportunistic eating leaves, buds, seeds, fruit, small vertebrates, and invertebrates.