The lot of the chameleon is to live on trees and subsist on insects. Its motions are sluggish. It lies close upon a branch, assuming a form and color suitable to concealment, with its mouth wide open. Its viscid mucus serves to attract insects, and the moment they come in contact with it they are securely caught. When within two or three inches, the tongue is thrust out like a flash, the intruder is caught on the swab and drawn into the mouth. The tongue is then drawn down the throat, carrying the victim alive into the stomach. Beyond this we are not able to trace the process. We have seen grasshoppers to the number of half a dozen thus drawn in one after another.
Whether the change of color and form is voluntary or not, I have been unable to determine. From careful observation I am inclined to the opinion that it may be both voluntary and involuntary. Change of form seems to be quite under control, and change of color appears to be so at times.
Their intelligence seems to be of a very low order. After being separated they greet one another with open mouth and a hiss. They manifest no emotion, and no form of petting seems to be appreciated. Their instinct is to conceal themselves from observation, to climb to the highest available point, and to lie with open mouth waiting for their prey to come to them. The only activity they manifest is in the use of the tongue, and in this they are not excelled by any other animal.
In conclusion, we may notice some prominent marks of design and adaptation:
1. The power to change color and form affords the means of concealment.
2. The sharp claws and muscular power of feet and tail fit it for its abode on the branches of trees, often swayed and dashed about by the fierce tempest.
3. The tenacious mucus of its mouth attracts insects, while the darting tongue by the rapidity of its motion is an offset to the sluggishness of-the creature's movements.
4. Its armor-plates afford a protection from other marauders, and also from the heat of the sun and the inclemencies of the weather.
5. It is the friend of man, subsisting mainly if not entirely on insects that are injurious to vegetation.
