What a poser! I surprised myself by shouting out 'bustard!' Seems the pictures in the book had stayed with me even though I hadn't brought it with me.
Kori Bustard, northern TZ
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.