Question

how does the chameleon changes its cotour ???

Answer 1

Unlike other animals that change color, such as the squid and octopus,chameleons do not modify their hues by accumulating or dispersing pigments within their skin cells, the researchers found. Instead, the lizards rely on structural changes that affect how light reflects off their skin, the researchers said.

Answer 2

Chameleons have two layers of special skin cells, the researchers found. The upper layer, which is more prominent in males than in females and juveniles, can change color by changing its structure and how it reflects lights.
The chameleon's uncanny ability to change color has long mystified people, but now the lizard's secret is out: Chameleons can rapidly change color by adjusting a layer of special cells nestled within their skin, a new study finds