Henry Ogg Forbes,
A Hand-book to the Primates — Cercopithecinae Part I, and Appendix to Volume I
(1894)
“ The animals wander about in companies, inhabiting chiefly the dry, rocky, mountainous regions in the interior of West Africa, feeding on the peculiar vegetation that they find there; digging up the roots of grasses, and gnawing with their strong jaws the roots and stems of an extraordinary short, woody, top-shaped plant, known as Welwitschia, which produces in its youth two leaves, and never more in its lifetime, though attaining to a great age. ”
