3 species of South African vulture | Moholoholo Animal Rehabilitation Centre

Front: Hooded vulture (Necrosyrtes monachus)
Middle: Either white-backed vultures (Gyps africanus) or Cape vultures (Gyps coprotheres)(*)
Back: White-headed vulture (Trigonoceps occipitalis)
(*) If someone could identify the correct species, it'd be greatly appreciated!

Those are definitely Cape Vulture, they can be distinguished from white-backed vulture by their fairly larger build and their much lighter feather colour.

There are a few other ways of telling them appart, but I find that these are by far the easiest.