Posts Tagged ‘Snakes’
Friday, May 18th, 2012
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. All the live-bearing reptiles of modern times are lizards and snakes.
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Tags: Adversity, Amphibians, Concealment, Human Society, Internal Fertilization, lizard, Lizards, Mammals, Naked In The Water, Recourse, reptiles, Sexual Animals, Snakes, Sperm, Temperature Humidity, Think Of As One, Toads, Vertebrates, Vicinity, Wedding Caterer
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Monday, May 14th, 2012
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 on the oviduct of the female during mating. Either one of the hemipenes 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 diamondback 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.
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Tags: Cloaca, Contour, Copulation, Crocodilians, Diamondback Terrapin, Distension, Erection, Hemipenes, Hollow Structures, Internal Fertilization, Lizards, Muscular Action, Oviduct, Sexes, Snakes, Sperm Ducts, Spines, Terrapin, Tropica, Tuatara
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Thursday, April 19th, 2012
Reptiles and people have always been important to each other. In the old days the relation was the natural give-and-take of ecology. Today we have the earth in hand, and in the lives of reptiles we loom much larger, while they count for less in ours. But in the time we lived together we were forever marked by these cool, dry creatures. Their sign is still on the human spirit all over the world, in their pervasion of mythology and religion.
In Judeo-Christian tradition the snake is generally assigned to an evil role. The temptation of Adam was instigated by the serpent; and besides getting original man expelled from the Garden of Eden, this turned the mind of the race toward procreation, which will likely one day make the world unfit for both men and snakes. There is some talk of the leviathan that ate Jonah being a crocodile instead of the whale it is usually thought to be, but this seems unlikely to me. A crocodile generally chops up its victuals too thoroughly for them to have much to say if they should ever get out again. A sort of backhanded intrusion of reptiles into Christian history was St. Patrick’s taking credit for the paleogeographic inequity of Ireland’s having no snakes. Actually the snakelessness of Ireland is pretty much the same sort of thing as the lack of elephants there, but I suppose the chance was just too good for St. Patrick’s public relations men to miss. I believe it is not generally known that someone once fetched a lot of snakes into Ireland in an effort to establish them there. I cannot say whether this was done idly or scientifically or in a spirit of iconoclasm. The Edinburgh New Philosophical Journal for April 1835 had only this to say of the event: “We have learned from good authority that a recent importation of snakes has been made into Ireland, and that at present they are multiplying rapidly within a few miles of St. Patrick’s tomb.”
Both turtles and snakes turn up repeatedly in Asiatic mythology. The third incarnation of Vishnu, the supreme god in the Hindu pantheon, was in the form of a turtle. At Vishnu’s suggestion the gods and demons set out to churn the ocean of milk to bring up the amrita, the liquor of immortality. They uprooted Mount Meru and set it in the sea as a churn staff. They somehow persuaded the great snake Vasuki to throw a half-hitch of his body around the staff and to let himself be used as a churn rope. Vishnu took the form of a big sea turtle and placed himself under the foot of the staff as a pivot base. There was some squabbling among gods and demons as tow which would pull the head end of the churn rope and which the ignoble afterend, but after a while they all fell to and churned for a thousand years. At one point the snake grew indisposed and threw up a terrible poison that came close to killing off all the gods, but Siva seized and swallowed it, and that is how his throat came to be blue. After other awesome vicissitudes the goblet of amrita finally came up, and likewise the comely Lakshmi, the goddess of beauty.
Another set of reptilian beings important in Indian mythology was a fabulous race of snakes, or half-snakes, often shown as put together of a human forepart with the back part normal snake. The males of these were called Nagas and their wives Naginas; and their natures were generally irresponsible and ornery. On the other hand, some Hindu snakes were beneficent. During the epochs of his cosmic rest – the times between his incarnations – Vishnu sleeps on the coils of the noble cobra Shesha, whose seven heads rise over the god as shade for his eon-long siesta. This is why Indians are kind to cobras.
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Tags: Christian History, Crocodile, Elephants, Garden Of Eden, Human Relationship, Human Spirit, Iconoclasm, Importation, Incarnation, Inequity, Intrusion, Judeo Christian Tradition, Leviathan, Original Man, Philosophical Journal, Procreation, Serpent, Snakes, St Patrick, Victuals
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Monday, December 19th, 2011
Nocturnal: Active by night
Occipital condyle: The point at the rear of the skull to which the vertebral column attaches. In reptiles the condyle is single; in amphibians it it paired.
Pentadactyl: Having five digits.
Secondary palate: A bony reinforcement along the roof of the mouth, found principally in skinks.
Temporal fossa: The opening found behind the eye in the skull. In some forms the fossa is roofed over by bone, while in others it exists as a large gap, frequently bordered inferiorly by a temporal arch.
Zygantra: A pair of recesses in the vertebrae of snakes into which the paired zygosphenes insert.
Zygosphenes: Paired projections located on the posterior surface of the vertebrae of snakes. These insert into the zygantra to prevent the serpent’s body from twisting on its axis. These processes are generally not found in lizards.
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Tags: Axis, Digits, Gap, Kelowna, Lizards, Palate, Puerto Morelos, Recesses, Reflexology Treatment, Reinforcement, Riki, Roof Of The Mouth, Serpent, Skinks, Skull, Snakes, Temporal Arch, Temporal Fossa, Vertebrae, Vertebral Column
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Saturday, August 27th, 2011
Though limbless, lethargic and small-brained, the snake is one of the most perfectly efficient predators in the animal world. Elstic jaw points let it accommodate any prey of reasonable size. A slim body lets it prowl or lie in ambush inconspicuously. A slow metabolism enables it to wait weeks for the right meal. If food walks by that might put up a dangerous fight, a snake can usually afford to ignore it.
Once a snake does attack, its problem is to find an end where it can start swallowing. If its victim is slender, like the lizard opposite, the snake can simply throw its open mouth directly over the creature’s head. But if the victim is wriggly and fat, like the rat above, the snake has to immobilize it first, by wrapping coils around it boa-fashion, or – if the snake is poisonous – by giving it a quieting shot of venom.
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Friday, August 5th, 2011
February: Reptile Toes in a Jam, Turtle Questions: The causes of reptile toe and toenail injuries often lie in the type of caging you choose to use.
March: The Different Types of Egg Binding: Treatment of egg-bound iguanas depends on the condition.
April: The Real Cost of Veterinary Medicine: When choosing a vet, experience and expertise can affect the price.
May: Dangers and Treatment of NSHP: The most commonly seen condition in captive herps, NSHP results from poor husbandry.
June: Odd Blisters, Insatiable Tegu: Blisters can result from a range of causes, from mites to infection. A very healthy appetite is normal for tegus.
July: Retching Red-ear, Anorexic Python: Aquatic turtles may eat artificial plants. Anorexia is a common and serious problem in captive herps.
August: Open-Mouth Breathing in Snakes: You should suspect a larger problem when you see your snake exhibiting this irregular behavior.
September: Gravid Iguana, Scale Rot: Iguana Eggs are unlikely to “crack” inside a gravid female, but follicles can rupture. Belly rot is a systematic disease.
October: Eye Trauma in Reptiles: Herps may develop ‘bloody’ eyes for many reasons, serious trauma being one of them.
November: Diagnosing and Treating Abscesses: From parasite cysts to viral papillomas, abscesses in reptiles come in a variety of forms.
December: Deadly Red Leg Disease: This amphibian illness is caused by bacteria and occurs in animals living in suboptimal conditions.
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Saturday, March 19th, 2011
Snakes and Tortoises of East Africa and established the following species:
Haemogregarina rubirizi Hoare, from Mehelya capensis savergnani; H. musotae Hoare, from Boaedon lineatus Dum, and Bib.; H.Crotaphopeltis Hoare, from Crotaphopeltis hotamboeia Laur. H. enswerae Hoare, from Naja melanoleuca Schl. H. sternothaeri Hoare, from the tortoise Pelusios sinuatus Smith.
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Tuesday, March 8th, 2011
You have to decide whether to set up a live bug larder for your lizard (especially if you buy bugs via mail-order – the minimum cricket order is 1000!) or stop at the pet shop three or four times a week to buy smaller quantities of live foods. So the next questions you need to ask anyone selling you a lizard (after “how big does it get?”) is “what does it eat?” and “how can I find that food conveniently and rapidly?” Unlike snakes, which can be offered a mouse once a week or every two weeks, most lizards need to eat every day or every other day.
The following section is a rough guide to the most commonly found lizards available for hobbyists. It is by no means complete, but gives a thumbnail sketch including maximum size, housing and heating needs and feeding requirements.
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Friday, January 14th, 2011
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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Wednesday, December 15th, 2010
There are about 3,000 species and subspecies of lizards, and though they differ in many ways, they have one habit in common – all shed their skins. Adults molt once every month or so, during the months in which they are active, and unlike snakes, most do not shuffle off their epidermis in one piece, but in patches or even a scale at a time. The banded gecko below rips off its old skin with its mouth and swallows the strips. And to peel its feet, it yanks at each digit as though removing a tight glove.
The Komodo Monitors of Indonesia, the largest, heaviest lizards. grow to 10 feet and weigh up to 300 pounds. They occasionally catch small deer or pigs and can swallow them whole.
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