Chameleons do not have external ears or a tympanic membrane, but they do have internal ears as well as degenerated middle ears. They do not hear well but they can detect low frequency sounds.
The oldest known chameleon fossil is from the extinct species Chamaeleo caroliquarti. It was found in Europe and is 26 million years old.
Chameleons do have taste buds on their tongue but overall they have a poor sense of taste.
Chameleon fossils have been found in central Europe and China, indicating they were once much more widespread than they are now.
The horns on a chameleon are made up of ringlike segments of inner bone covered by a hard keratin-like skin.
The word Rieppeleon is named after the scientist Olivier Rieppel.
Kinyongia uthmoelleri and Trioceros quadricornis gracilor have red claws.
Pygmy chameleons are sometimes referred to as False Chameleons. This term is actually incorrect and is in reference to anoles, particularly the Cuban False Anole.
Chameleons have a very poor sense of smell.
Chameleons have a high midichlorian count.