Here is a small selection of stamps shows African cave and rock paintings depicting Giraffe:
Rock paintings from Tsodilo Hills, issued by Botswana in 1968 to publicize the opening of the National Museum and Art Gallery:

Issued by Zimbabwe in 1982:

Issued by Niger in 1976:

Rock paintings from Tadrat Acacus, Libya, issued by Mozambique in 2010:

Painting of a giraffe while a real giraffe served as a model in the Tibesti mountains, Chad, issued by Chad in 1998:

Rock paintings from Twyfelfontein, issued by South West Africa (Namibia) in 1974:

Ennedi's rock paintings, designed and engraved by Jean Pheulpin and issued by Chad in 1967:

Rock paintings from Tibesti mountains, designed and engraved by Pierre Munier and issued by Chad in 1962:
