THE REPTILES OF THE UNITED STATES.

The reptiles are a cla.s.s of vertebrate animals. By vertebrate animals is meant those having a backbone. Reptiles are cold-blooded animals having scaly skins, and breathing by lungs and not by gills as do the fish.

Strange as it may seem they are related to the birds. In prehistoric times they were of enormous size and many of them were capable of flying. Fossil forms of reptiles are very numerous and scientists have given these fossil forms such sonorous names as Dinosaurs, Ichthyosaurs, Plesiosaurs and Pterosaurs. These names are made up of Greek words meaning terrible lizards, fish lizards, near lizards and winged lizards.

The cla.s.s of reptiles is made up of five orders:

Sphenodons; Lacertilia; Ophidia; Chelonia; Crocodilia.

Of the Sphenodons, there is but one living representative. Its home is in New Zealand. Zoologists tell us that this reptile is more closely related to its fossil cousins than any other now in existence. Since we are considering only those reptiles which an American boy may find living in their natural haunts in his home land, discussion of the Sphenodon is out of place in this article. We recommend, however, that you read up about this curious creature that links the gigantic prehistoric lizards with the little creatures of to-day's world.

[Ill.u.s.tration: PTEROSAURS.]

THE LIZARDS

THE LACERTILIA OR LIZARDS.

[Ill.u.s.tration: LIZARDS.

1. ZEBRA-TAILED LIZARD.

2. PACIFIC SWIFT.

3. COLLARED LIZARD.

4. WHITE-BELLIED SWIFT.

5. COMMON SWIFT OR FENCE LIZARD.]

Lizards differ from snakes in that the right and left halves of the lower jaw are joined together by bone instead of elastic ligament and in that they have legs and eyelids. They are found in the warmer climates.

Most of them live on insects, but some types as, for instance, the Iguanas, live entirely on vegetable matter, while others prey on birds, mice, frogs, etc.

THE GECKOS.

The Geckos form a large sub-order of lizards. Their chief characteristic is their adhesive toes, which enable them to cling to and run on smoothest surfaces even when upside down. They do not like the hot sunlight and largely feed at twilight and at night. The Reef Gecko is found in Florida; the Warty Gecko, so called on account of the rows of large wart-like scales on its back and sides, inhabits Lower California; the Cape Gecko, Lower California; the Banded Gecko, Texas, New Mexico, Arizona and California. The latter is the most gaudily marked of the Geckos found in the United States and is likewise the most abundant. It may be seen at dusk coming out of rock crevices to feed on small insects. Many consider this lizard poisonous and its saliva is supposed to produce painful skin eruptions. Authorities, however, tell us that this is not so. The first three Geckos mentioned live largely in trees, but the Banded Gecko lives on or near the ground.

THE CHAMELEONS.

The American Chameleons are not true chameleons, but belong to the same family as the Iguana. They have come to be known as Chameleons because, like the rightful owners of that name, they change the color of their bodies. This change is occasioned by the differences of temperature and light. One species is found in the United States and is known under various names, such as the green lizard, the fence lizard and the alligator lizard. It is called alligator lizard from its resemblance to a young alligator. This lizard is found in the southeastern United States from North Carolina to Florida. The common colors of the American Chameleon or the Anolis, which is its scientific name, are brown and green. These colors vary with conditions. When asleep, for instance, this little reptile is green above and white below, and when fighting or frightened it becomes green; at other times it is brown. Raymond L.

Ditmars, Curator of Reptiles in the New York Zoological Park, says that in collecting these lizards and placing them in wire-covered boxes, he has "always noted their change from various hues, prior to capture, to a scrambling collection of several dozen emerald-green lizards. If the gauze cage be laid down for half an hour or so while the collector rests, the lizards soon take on a brownish tinge, but as soon as the box is again carried about and the occupants are shaken up and frightened, the brilliant color appears among them all." He further says that "there is no relation or influence between the lizard's colors and its surroundings. The change of color is brought about princ.i.p.ally through temperature and light and their influences on the creature's activity; also by anger, fear and sleep."

The Anolis stalks its prey like a cat does a mouse. It crouches and creeps forward for the final spring with motions that are exactly similar. It lives in trees and feeds upon insects. These little creatures make interesting pets and will soon learn to take their food from your hand. The proper quarters for it is a wire-covered fernery which should be placed in a warm but moist situation and the foliage daily sprinkled with water. The Anolis is a great water drinker and will find the drops adhering to the leaves of the plants.

THE IGUANAS.

There are but few species of Iguanas found in the United States and these only in the southwestern part. They are large in size and have a crest of spiny scales running along the neck and back. They use their tails as weapons of offense and defense. The Cape Iguana is a species found only in Lower California. The tail is ringed with large spines.

The Black Iguana is found in southern Arizona. It is a great fighter when at bay and is then no mean antagonist. It does not invite a fight, however, but will run if there is any chance of escape. Both of these Iguanas reach about four feet in length. They have large appet.i.tes and eat both animal and vegetable matter--birds, small animals and tender vegetation. In central and southern America their flesh is prized as a food and it is said to have the flavor of chicken. They live part of the time in trees and part of the time on the ground. The Desert Iguana, however, is terrestrial. It is found in the desert parts of the southwestern United States--in Colorado, California, Arizona and Nevada.

It is largely vegetarian. The tail is brittle, and to free itself when held by it, this creature will easily and readily snap it off.

[Ill.u.s.tration: IGUANA.]

THE CHUCKAWALLA.

There is only one of these that is fairly common in the United States and that is found in the deserts of the southwest. It is the largest lizard found there except the Gila Monster which will be described later. The body of the Chuckawalla is broad and the legs short. Its length averages about a foot. It lives mostly among the rocks of the deserts.

THE COLLARED LIZARD.

This lizard is so called on account of the markings of the neck, which have the appearance of a double black collar. The throat is an orange color. It is one of the most gayly colored of the small lizards. It is quite common in the dry and stony parts of the western states and in western Texas is very abundant. It is a great eater and is not afraid to fight for its dinner. One peculiarity of this lizard is its ability to run on its hind legs. It will gulp and bolt food as large as itself.

THE LEOPARD LIZARD.

In color it is yellow, spotted with dark spots and lined across the back with dull red lines. Its habitat includes Oregon, California, Nevada, Arizona, New Mexico and Texas.

THE ZEBRA-TAILED LIZARDS.

These are small ground lizards found from Texas to California, especially in the dry sections. They run with great rapidity with the tail curved upward, which exposes the markings of the lower surface.

Frequently they run like the Collared Lizard, on the hind feet. The black-and-white tail markings account for their name.

THE SPOTTED LIZARDS.

These are small ground lizards found in many states from Kansas to California and southward. They are very quick in their movements. Their food consists of insects of the more sluggish type. They do not stalk their prey like the chameleons.

THE SWIFTS.

There are a great many species of these small lizards in the United States. They live on the ground among rocks in dry places and are called swifts on account of the speed with which they are able to get over the ground. Some of them are covered with spiny scales. Clark's Swift is abundant in certain parts of the country. It is found in California, Arizona, New Mexico, Nevada, Utah. It is fond of the strongest sunlight.

The Yellow Striped Swift is found from Texas to Nebraska on the north, into Mexico on the south and California on the west.

The Common Swift is found abundantly both in the eastern and in the western United States. They like dry, sandy places among fallen trees, fences, old wood, etc. In color they are gray and are usually in harmony with their surroundings.

The Collared Swift lives among rocks in Arizona, New Mexico and Texas.

It has a black collar with very sharp spiny scales.

THE HORNED LIZARD.

These lizards are commonly called Horned Toads, because of their resemblance in the shape of their bodies to that of a toad and of their spiny scales which have the appearance of small horns. Their habitat is in the hottest and driest parts of the country. They are fond of the hottest sunlight and bury themselves in sand at the approach of evening.

The Regal Horned Lizard is found in Arizona and Colorado.