Like snakes, chameleons do not have an outer or a middle ear, so there is neither an ear opening nor an eardrum. However, chameleons are not deaf.
 They can rotate and focus separately to observe two different objects simultaneously; their eyes move independently from each other.
Chameleons mostly change color to regulate their temperatures or to signal their intentions to other chameleons.
The feet of chameleons are highly adapted to movement in trees.

Information Sources

- Wikipedia
- Twisted Sifter