The largest living bird in the world, the Common Ostrich has a number of subspecies, this one is the Masai, or Maasai, subspecies.
Males Ostrich tend to have dark black colour feathers and a reddish neck and legs that get brighter during mating season. Female Ostrich have duller, grey and brown colour feathers.
This one was photographed in Ngorongoro Crater, Tanzania.