n.p. Cheloniidae, n.d. State Proof. This marvelous black and white etching of a walking hippopotamus is a one of a kind print signed by renowned artist and printer Alan James Robinson, particularly well known for his depiction of animals, birds, and nature. He founded the Cheloniidae Press in 1979, and his work can be found in many public and private collections around the country. The hippo appears to be walking toward the viewer with his head done in particular detail. In fine condition. 22 x 28.5 inches. PRINTS/072517. Fine.