Jackson's Chameleon, UgandaA bonus on gorilla treks is that we occasionally see a Jackson’s chameleon. Also known as the three-horned chameleon, these guys are medium-sized chameleons and the males get to about 15 inches in length. The males also have the three horns, which give them a triceratops-like appearance. Nikon Z8 with Nikkor 180-600mm lens (at 600mm) ISO 1400, f/6.3 at 1/1250th of a second.