Do you know how and why chameleons change their color?
All humans and most animals have melanin. Melanin is the pigment that makes your skin the color it is. If you have more melanin, your skin will be darker. If you have less melanin, your skin will be lighter.
A chameleon has four layers of skin. The first layer is tough and has no color; it is there to protect the chameleon from cuts and scrapes. The next layer has red and yellow pigment, while the cells in the third layer are blue. Finally, there is the fourth layer, which has melanin.
A chameleon looks green most of the time. This is because the light from its second and third layers mix. This also helps chameleons blend in with their surroundings. When a chameleon feels the need to warm up or protect itself, it will send messages to its second and third layers of skin cells to shrink, which makes the chameleon turn a darker color.
Though a chameleon's color might not seem like that big of a deal, these fascinating creatures depend on being able to change their color to survive!
[Source: How Do Chameleons Change Their Colors?]