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"When the animal wishes to use these teeth, they issue from this fleshy sheath, somewhat in the same manner as the claws of a cat when about to be used as weapons of offense."

Fangs and Tongue of an Adder

"When the animal wishes to use these teeth, they issue from this fleshy sheath, somewhat in the same…

When irritated, the neck of a cobra swells at the same time it raises the front part of its body vertically, holding it straight and rigid.

Cobra

When irritated, the neck of a cobra swells at the same time it raises the front part of its body vertically,…

Cobras are venomous snakes of the familys Elapidae, of several genera, but particularly Naja. (Non-cobra elapidae include the taipans, brown snakes, tiger snakes, fierce snakes, coral snakes, mambas and sea snakes.) Cobras generally inhabit tropical and desert regions of Asia and Africa. When feeling threatened, cobras can rear up and flatten their heads into an instantly recognisable warning posture. The rest of the time their heads are symmetrical and they look much like any other snake bites.

Cobra Head

Cobras are venomous snakes of the familys Elapidae, of several genera, but particularly Naja. (Non-cobra…

These venomous snakes have triangular heads and short stocky bodies. They are a highly poisonous snake.

Puff-adder

These venomous snakes have triangular heads and short stocky bodies. They are a highly poisonous snake.

"Viper is a genus of venomous snakes. This family includes many important forms– e. g., the common adder, the asp, extending as far N. as Sweden; the African horned viper and puff adder, the Indian daboia or Russell's viper, and the Indian Echis carinata. The head is relatively broad, somewhat triangular, and generally covered with scales; the eye has a vertical pupil, and there is no pit between it and the nostril; the maxilla bears on each side one functional fang, usually with several reserve fangs beside it; the poison is virulent. The vipers are widely distributed through Europe and Australia; the majority are African. As far as is known they are viviparous."—(Charles Leonard-Stuart, 1911)

Common Viper

"Viper is a genus of venomous snakes. This family includes many important forms– e. g., the common…

"Viper is a genus of venomous snakes. This family includes many important forms– e. g., the common adder, the asp, extending as far N. as Sweden; the African horned viper and puff adder, the Indian daboia or Russell's viper, and the Indian Echis carinata. The head is relatively broad, somewhat triangular, and generally covered with scales; the eye has a vertical pupil, and there is no pit between it and the nostril; the maxilla bears on each side one functional fang, usually with several reserve fangs beside it; the poison is virulent. The vipers are widely distributed through Europe and Australia; the majority are African. As far as is known they are viviparous."—(Charles Leonard-Stuart, 1911)

Common Vipers

"Viper is a genus of venomous snakes. This family includes many important forms– e. g., the common…