I believe it's right that Nicolas questions the contentment of his pet chameleon. To his credit he's considering his actions and the well being of his loved pet.
Imagine if you were taken from your birth of origin, country, culture, language, way of life, comfortable home and surroundings and displaced into unnatural confinement. Regardless if you were well taken care of, loved, admired the loneliness and isolation that you would feel separated from your family, friends, activities would create distress. How could it be different for this chameleon or any other wildlife taken from it's natural habitat?