Its respiratory system is better. The nostrils are separated from the mouth by a hard palate. When the alligator swallows a struggling victim there is no danger that a desperate kick will penetrate the roof of its mouth and damage its brain. The alligator has well-developed lungs in comparison to the more primitive saclike structure of snakes. It has the most highly developed brain of any reptile, and is one of the few to have its teeth firmly set in its jaws.
On the other hand, the alligator lacks a well-developed Jacobson’s organ, which means that its ability to detect tastes and odors is not nearly so acute as a snake’s. It has the well-developed digestive system which works so efficiently for all reptiles, but lacks a bladder, although most turtles and lizards have one. Its ammoniac kidney wastes, along with intestinal wastes, pass through a chamber called the cloaca which opens to the outside of the body.
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Snakes are clearly derived from some ancient kind of lizard, and the two are put together in the order Squamata. One of the features distinguishing the lizards and snakes from other reptiles is a drastic reduction of bones in the temporal region of the skull, which reaches its extreme among the snakes. Another is that the anal opening in lizards and snakes is transverse, instead of longitudinal as in crocodilians and turtles. Finally, both snakes and lizards have paired copulatory organs, and both have distinctive sets of sensory cells in their mouths, called Jacobson’s organs.
As to differences between snakes and lizards themselves, most lizards can close their eyes, but a snake’s eyes remain permanently open behind a clear covering called the spectacle. The unblinking stare of snakes may account for some of the superstitious fears people have about them. Snakes also generally have a single row of widened scales under the belly, while the scales of lizards tend to be more nearly the same size above and below. Lizards typically have some sort or external ear; snakes have none. In most lizards the tail can be readily shed, evidently as an escape mechanism. In some, the broken-off section snaps and jumps about in an irresponsible way. It is easy to imagine that this allows the rest of the lizard to slip quietly away from the scene while its attacker is preoccupied with the twitching tail. Later, a new tail generally grows again, sometimes lighter in color, with a different scale pattern and shorter than the one that was left behind.
The most obvious difference between typical lizards and snakes, however, is the leglessness of the latter. Although there are lizards that have no legs and that superficially resemble snakes, it is still generally easy to draw the line between the two groups. At the same time, it also is helpful to keep in mind that snakes are really a specialized and quite successful sort of lizard.
Of the two groups of the Squamata, the lizards are of course the older. They have the conventional body plan of a typical land vertebrate: four legs, five toes to a foot, and the sprawling gait of the earliest reptiles. Most of the adaptations that have allowed them to spread and prosper are relatively unspectacular changes in the old four-legged look – exceptions being the various groups in which the legs have been lost completely. As vertebrates, lizards are a fairly representative group and it has been suggested that the lizard would be more suitable as a type with which to introduce freshman biology students to vertebrate anatomy than the universally used frog. Perhaps it sounds cynical to say so, but I think the answer there is that the frog, being tailless, fits dissection pans more gracefully.
In spite of their fundamentally conventional body plan, modern lizards are a diverse lot. They range in length from two inches to 10 feet. They may look like dragons and they may look like worms, and they show a complex adaptive range through terrestrial, arboreal, subterraneous and aquatic environments.
Out at my farm lizards are all over the place on warm days. The large family of the Iguanidae is there, represented by the slender anole that stalks insects on the screens, and by the scaly-backed fence lizards that bask on almost every log or stump. This is, as the name suggests, the group to which the big tropical arboreal and marine iguanas belong, and it includes a host of smaller forms. Its counterpart in the Old World is the family Agamidae, which has a curiously similar structural and ecological spread.
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Reflecting many different ways of life, the eyes of reptiles show an extremely wide range of adaptations and modifications. For example, the burrowing worm lizard, with little need for any vision at all, has vestigial eyes that appear only as a pair of tiny dots in the skin. But to the chameleon, keen vision is vital for survival, and its eyes are unique in a number of ways. Set on the tips of conical turrets projecting from the sides of the head and protected by eyelids which close to tiny peepholes.
In strong light the vertical pupil of the alligator’s eye closes to a slit, much like the pupil of a cat’s eye. Unlike a cat, however, the alligator’s pupil slit appears colorless in the daylight because the backing of its retina is white. But at night a dramatic change takes place.
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Thanks for running our article, “Endangered Relic,” in the October 2006 issue. We wanted to get the word out about the critical situation this lizard is facing. The good news is that because of the dedication and passion of the many people involved with “Project Heloderma,” there is now a chance to put money directly into the programs that will help save this lizard from extinction.
The International Reptile Conservation Foundation has set up a fund that will provide money to fund education programs within the home range of the Guatemalan beaded lizard, purchase critical habitat and put money toward an in-country captive-breeding facility to headstart and then release offspring back into their native habitat.
There is so much more to this constantly changing situation than I can update you on here, but if you visit the IRCF’s website www.IRCF.org, then you can keep up with the progress we are making. If readers would like to help save this critically endangered lizard, they can also go to www.IRCF.org to make a tax-deductible donation that will truly make a difference. This is one of those rare chances for those of us who share a passion for reptiles to actually make a difference in saving this beautiful lizard species.
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Reptiles are sexual animals and are the group that introduced internal fertilization to the vertebrate line. Thus, in a manner of speaking, they laid the foundation for the family unit in higher vertebrates, and from this came human society itself, with all its excitement and troubles. The ancestral amphibians deposited their eggs virtually naked in the water, and fertilized them by simply releasing sperm in the general vicinity. The hazards of such an informal operation to both sperm and egg are obvious. The reptilian egg, however, enters the world already fertilized, and packaged against a certain amount of environmental adversity. One need only compare the dozen or so eggs laid by the average lizard with the thousands laid by toads to see the great economy the new method has brought.
But even an egg with a shell is delicate. It can incubate successfully only within a narrow range of conditions of temperature, humidity and concealment. It is thus not surprising to find that a few reptiles have independently hit upon the recourse that we think of as one of the main attributes of the mammals – that of producing living young.
A fertile sea turtle lays round in a hole it has dug in warm, incubating sand of Australia’s Great barrier Reef. When about 100 eggs are laid, it will cover the hole and depart. During one breeding season a mature female will deposit from two to five clutches.
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Vitamin supplements are available for reptiles, and your pet store or veterinarian will be able to advise on the best for your pet. Always follow the instructions provided, and don’t be tempted to exceed the suggested doses. Females should be given additional supplementation during the breeding season.
If you buy a good, healthy animal to start with, feeding should present no problems. The trick is to offer a varied diet and to find out what your animal likes best.
Did You Know?
The iguana’s long, flattened tail is used as a rudder when swimming and also as a defense weapon. A lash from the tail would make any adversary think twice about taking on the iguana.
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Above the ocular cavity is a bone or pair of bones called the frontals. This is a centrally located bone met anteriorly by the nasals or occasionally the prefrontal. It is bordered posteriorly by the parietal. Along the border of the frontal and parietal, or often in the center of the parietal, may be found a single round hole. It is in this small aperture that the pineal gland or third eye is located. In species lacking the eye, this pineal foramen is often absent.
There may be a temporal arch, an arch of bone created by the postorbital and squamosal bones. The lower arch, formed by an extension of the jugal with the quadrate, is not found in lizards, but does occur in the tuatara, Sphenodon, a lizard-like animal of New Zealand. In some lizards and all snakes the upper temporal arch is lacking; in these forms the squamosal bone is rudimentary or absent.
One last aspect of the skull that should be mentioned is the occipital condyle, the point where the cranium is fixed to the skull. This is a point of bone (single in lizards and the other reptiles) where the first vertebra, the atlas, attaches to the skull. It is not always at the hindmost part of the skull.
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Iguanas can generally be fed by hand, but the consistency as well as consistencies of many foods will render the use of a feeding bowl more appropriate much if not most of the time. A constant food source should be available to the lizard, realizing that the animal is inclined by its nature , to be a forager. This suggests that its digestive system would be better served if the lizard were to ingest several smaller amounts of food thought the day rather than be compelled to consume all of the nourishment that it requires in one meal or one so called “sitting” or the animal.
The Iguana drinks water more than often , often at least 2 to three times a day. Low humidity in the Iguana’s surroundings will most likely if not probably make itself evident and apparent by the lizard’s increased intake of water and other fluids. Thus spraying water on the leaves of plants in the Iguana’s terrarium as a means of attempting to furnish an adequate supply of water for the lizard will fall short of the intended goal. The Iguana should always be provided with a water bowl that should be thoroughly cleaned and refilled daily and on a daily care basis. The habitat might include and additional container of water with which to soak its entire body and tail.
A hatching Iguana which measures close to 8 inches ( 20 cm) in length can usually be expected to grow approximately 1 to 1 1/2 inches ( 2.44 – 3.8 cm) per month for the first year or two. After the second year, the rate of growth declines to an average of much less than 1 inch ( 2.5 cm) each month. A fully grown Iguana might reach a maximum length of around 6 1/2 feet ( 203 cm) although 5 feet ( 152 cm) is probably more typical of the size attained by many species during a lifespan that probably ranges ten 2 to 25 years.
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