Animals

Chameleons have many distinct peculiarities. Each eye has a scaly lid in the form of a cone, with only a small round opening in the middle for the pupil. Eyes can move independently which gives a good range of view as well as the depth perception needed for aiming its extremely long tongue. The tongue has a thickened club-like tip that will grasp the prey by a combination of wet adhesion and muscular activity. An adaptation to arboreal life is the modification of the feet; toes are partially fused into two groups, two toes in one and three in the other, which can oppose one another. The tail also serves as a prehensile instrument; thus it cannot be shed and replaced like those of many other lizards.
Color changes in chameleons may depend on mood, changes of light, temperature, health, etc., and not just the background.