Mid-Pliocene bald ibis (Geronticus cf. calvus; Aves: Threskiornithidae) from the Cradle of Humankind, Gauteng, South Africa and its environmental and evolutionary implications

Mid-Pliocene bald ibis (Geronticus cf. calvus; Aves: Threskiornithidae) from the Cradle of Humankind, Gauteng, South Africa and its environmental and evolutionary implications