the southern ground hornbill

africa african arrival aves beak bill bird black botswana breeder breeding breeds bucerotidae bucorvinae bucorvus cafer carnivore casque conservation critically endangered every feathers feeding food for grassland ground horn hornbill large largest leadbeateri lived long longest looking plains protected rainy red safari savanna season sight slowest south southern species symbol three triennially very vocal vulnerable walk walking wattle wild wildlife years