A Chameleon changes color out in the wild of Madagascar

A Chameleon changes color out in the wild of Madagascar

Chameleons change color by dispersing or concentrating pigment granules (melanophore cells) in the cells that contain them. In general, the animal appears lighter-coloured when pigment is concentrated and dark when pigment is dispersed throughout the cells. The chameleon's colour state at any given time is controlled by a complex interaction of hormones, temperature, and the animal’s autonomic nervous system.

https://www.britannica.com/story/how-do-chameleons-change-colour

Chameleons or chamaeleons (family Chamaeleonidae) are a distinctive and highly specialized clade of Old World lizards with 200 species described as of June 2015. The members of this family are best known for their distinct range of colours, being capable of colour-shifting camouflage. The large number of species in the family exhibit considerable variability in their capacity to change colour. For some, it is more of a shift of brightness (shades of brown); for others, a plethora of colour-combinations (reds, yellows, greens, blues) can be seen.