O'Shaughnessy's chameleon, being closely related to
Parson's chameleon, is similar in shape and color but slightly smaller.
Albert Günther, the first to scientifically describe the species, stated that the type specimen is a male measuring 15.5 inches (39.4 cm) in total length, including its tail which is 9 inches (22.9 cm) long. It is mostly brownish gray, with a darker throat and jaw. Although lacking horns, the male of the species has a short, bony structure on the snout. The female does not have this structure. ==Behavior==