A snake is an elongate reptile of the suborder Serpentes. Like all reptiles, snakes are covered in scales. All snakes are carnivorous, eating small animals including lizards, other snakes, small mammals, birds, eggs, fish, snails or insects.

Snakes can be distinguished from legless lizards by their lack of eyelids, limbs, external ears, and vestiges of forelimbs. The 2,700+ species of snakes spread across every continent except Antarctica ranging in size from the tiny, 10 cm long thread snake to pythons and anacondas over 5 m long. In order to accommodate snakes' narrow bodies, paired organs (such as kidneys) appear one in front of the other instead of side by side.

Stone Masonary, pool patios, Bushes, Shrubs, Crevices, bird feeders, and compost piles are drawing points for snakes. They are all ideal habitat for Rats, insects, voles and birds. Hence snakes dwell in these areas which provide ambient conditions for living and also food. They may also hunt in the vicinities for food like rats.

The fear, dread and disgust of snakes is one of the stronger basic instincts present in man; which is the main cause for snakes becoming endangered. This results in an ecological imbalance. Snakes do serve a useful purpose in the control of other pests, notably rats, mice and the like.

Rod of Asclepius
Snakes symbolize healing through ecdysis.
Asclepius 0f Ancient Greece first used this symbol on his wand; and now seen on Ambulances and other medical fields.

Snakes sense odors from the surrounding environment by "tasting" the air around them. Through the characteristic tongue flicks, quick extension and retraction of the tongue, snakes pick up odorant molecules from the air and transfer them to the vemeronasal epithelium which is a sensory tissue within the mouth. The function of this tissue is to detect, analyze, identify and locate the source of odors. 

However snakes are undesirable in some areas such as residential locations. Toward reaching this goal it is preferable to discourage or physically repel snakes from those areas and allow them to be alive elsewhere to fulfill their role in the ecological scheme.

The venom is modified saliva, delivered through fangs.
In all venomous snakes the poisonous glands open through ducts into grooved or hollow teeth in the upper jaw. 
It is a complex mixture of enzymes, polypeptides, glycoproteins, and metal ions. Among the deleterious components are hemorrhagins that promote vascular local and systemic bleeding. Proteolytic enzymes cause local tissue necrosis, affect the coagulation pathway, and impair organ function.


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