The time from fertilization to the birth of the larvae is about ten months. Sometimes the sperm packet may be retained in the cloaca for several months, even though the winter, so that eggs may be fertilized at a more favorable time. The larvae develop full term in the eggs while still in the body of the parent, who will seek out a suitable body of water as soon as birth becomes imminent. Only cool streams and ponds in half shadow are selected. The female will search for a suitable shallow spot into which she can release up to 50 hatching eggs or newly hatched larvae. In certain cases, especially in the southern part of the range or where free water is scarce, the larvae may be retained right through metamorphosis and tiny replicas of the adults may be deposited.

At birth, the larvae are about 2.5 cm (1 in) in length and are colored somewhere between yellowish gray and brownish black. The body is usually speckled with little yellow spots, with a larger one at the base of each leg; the latter spot is a trademark of S. salamandra larvae and is not present in the larvae of related species.

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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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Many of the live-bearing reptiles, however, belong to groups that have egg-laying members too. The skinks, the lacertas, the boids and the vipers are examples. There are even species that lay eggs in some parts of their ranges but bear live young in other parts. This suggests that their viviparity – as the ability to produce live young is called – is not so formal an undertaking as it is in mammals, and this is true. Some reptiles merely keep the eggs inside the body, for varying periods up to and after hatching time. In others there are extensive, placentalike connections with the tissues of the maternal oviduct. In one type the yolk sac is merely plastered against the wall of the oviduct, and is used primarily for respiration. In a more advanced type the embryonic membranes,the chorion and allantois, interfold with maternal tissues and the embryo not only gets water and nourishment as well as oxygen, but conveniently has its excretory wastes taken away too. None of the live-bearing reptiles has dispensed with a big store of yolk as the main source nourishment for the growing embryo.

All reptiles practice internal fertilization. In all modern forms except the tuatara the male has an organ kept turned outside in, in the base of the tail, and everted through the opening of the cloaca during erection. In the tuatara the transfer of sperm is accomplished by bringing the genital openings into contact, as in birds. This was probably the method used by the ancestral reptiles – it is clear, in any case, that the penis had separate origin in turtles, crocodilians and mammals on the one hand, and in lizards and snakes on the other.

Thus, male lizards and snakes have not just one, but a pair of hollow structures called hemipenes, which make up their copulatory organs. located as they are in the tail just behind the opening of the cloaca, the hemipenes often give the tail of the male a thicker, more gradually tapering contour than that of the female, and in many species the sexes can be distinguished by this difference. A groove that serves as a channel for the sperm extends from the opening of the sperm ducts along the inner wall (which is the outer wall during erection) of each hemipenis, and the surface may be pleated or set with spines that keep it in place in the oviduct of the female during mating. Either one of the hemipenis may be used, but only one, the one nearest to the female, is everted and protruded from the cloaca during erection, which is brought about by a combination of muscular action and distension of the walls with blood.

Among different reptiles fertilization is scheduled differently with respect to the time of nesting. In most species it seems to occur, as might be expected, just before the eggs are laid; but in some the sperm may live on in the reproductive tract of the female and continue to fertilize eggs months or even years after copulation has taken place. The longest known periods of such deferment of fertilization are four years for the diamond back terrapin of the southern United States, and five years in the case of the tropical American cat-eye snake. The green turtle, which evidently mates only in the sea off the nesting beach, often does so after the female has gone ashore and laid her eggs. Since a given female makes her migration to the nesting ground only once in three, or more turtles.

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Occasionally a recently imported iguana is found which is free of mites and ticks but is still wasting away, although eating well. This animal may be suffering  from pin worms or other internal parasitic worms. His cloaca will be loaded with them and your veterinarian will be able to find them in the feces in the same way he examines dogs and cats. He may be able to treat your pet successfully. The problem is usually that the pet owner doesn’t recognize that there is a problem until the specimen is on the threshold of death.

If you wish to avoid problems like this, start with a bright eyed healthy animal and keep him clean and isolated from other animals which may be infested with parasites.

Your pet may not wear down his toenails as fast as they continue to grow. If you notice that they are twisting under or corkscrewing, you might do well to prune them a little. Go at it slowly until you find how far to clip without striking living tissue – the part of the nail nearest the toe is actually alive and is supplied with veins, arteries and nerves.

You should use a tool which cuts the nail but does not splinter it by crushing. For a young iguana, perhaps an ordinary fingernail clipper will suffice. Larger lizards will need the tool which is used for dogs. Perhaps you can buy one in your pet shop. You should not ever strike the “quick,” but if you do, you can stop the flow of blood with a styptic pencil – this is just alum and is available in your drugstore or from nearly any man who shaves with a razor. As with any minor wound, it can be treated with an antiseptic cream, but it will probably heal uneventfully regardless of whether you treat it or not.

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Thus , male lizards as well as snakes , not just one , but indeed a full pair and pairing of what are essentially hollow structures called or referred to as  “hemipenes” ,   which make up what are in effect  “copulatory”  organs .  Located as amazingly they are ,  in the tail areas ,  behind the opening of the cloaca , these hemipenes often give  the tail of the male reptiles , a thicker more gradually  contoured tail than that of the females  .  In many species the sex of the reptile can be distinguished by this difference – which is sometimes rather slight in some.

A “groove”  serves as the channel for the sperm .  This groove extends from the opening of the sperm duct  extends from the opening of the sperm duct along the inner wall  ( which of course serves as the outer wall during the erection period / periods), of the hemipenis,   and the surface may be pleated or set with actual spines which keep it in place in the oviduct of the female during mating.   Either one of the hemipenes may be used , but only one and only one.   The hemipene nearest to the female is everted and protruded  from the cloaca during the erectile period .  This is brought into effect by both a combination and combinations of muscular action and muscular actions  and distension of the very walls with blood and blood fluids.

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