Did chameleons always change colour or did they develop the ability over time ?

Chameleons 

Most chameleon species evolved a basic camouflage colouring and pattern which blends with the land and trees they live in. Variations in the light level, the surrounding temperature, or his emotions can make a chameleon change colour. They alter their colour like we blush. An angry chameleon darkens with rage.

The non-chameleon relatives have the ability to change colour. Colour change in lizards, in general, is associated with temperature.

Many lizard species darken to absorb more solar energy and warm up, especially in the morning. Chameleons, however, change colours faster than other lizards and more dramatically. The capacity, moreover, is universal among all chameleon species. Thus, this ability probably evolved long ago in the ancestor of all present day chameleon species.

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