Snakes are ectothermic reptiles belonging to the sub-order serpentes and are thought to have evolved from lizards. Though the different species of snakes exhibit diversities in structure and habit, they closely resemble each other. Many of them are poisonous. These poisonous snakes bear well-formed biting/poison apparatus that makes them a dreadful creature. (Less than one-third of the 2,500 to 3,000 snakes species are listed in poisonous category, of which less than 300 species may be harmful to humans.) The poison apparatus includes :- A pair of poison glands Their ducts A pair of fangs Associated muscles (1) Poison Glands - Poison glands are modified superior labial or parotid glands. - Poison glands are situated one on either side of the upper jaw, below the eyes or somewhat behind them. - These are sac-like (as in sea snakes), tubular (as in vipers), or almond-shaped (as in cobras). - The poison gland is thickly encapsulated in dense fibrous connecti
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