Robert Louis Caldwell, Kutokua Na Hatia (colobus monkey), graphite pencil, 15 x 6. ← Previous Next → Robert Louis Caldwell, Kutokua Na Hatia (colobus monkey), graphite pencil, 15 x 6. Robert Louis Caldwell, Kutokua Na Hatia (colobus monkey), graphite pencil, 15 x 6.