Snakes.

Nearly 3,000 species of snakes are now found within the tropical and sub-tropical parts of the planet. Out of those, about 300 are Poisonous et al. are Non-Poisonous. WHO has estimated that thirty to forty thousand people die annually of snake bite. Snakes don’t seem to be found in New Zealand and Ireland. Snakes are slender and elongated reptiles without limbs, eyelids, and external ears. the entire body is roofed with epidermal scales and shields. The scales and little and typically overlap one another but the shields are large and join one another by their margins. Shields are prominent on the pinnacle. The occipital condyle is single and tripar­tite. The mandibula is attached to the skull with the assistance of quadrate which articulates in such a movable fashion that the jaw can move laterally and downwards. the 2 halves, of the mandibula, are loosely articulated. of these are a special adaptation for- its peculiar feeding habit. The teeth are conical, recurved backward, and stuck on jawbones. In poisonous snakes, two maxillary teeth (one on either side) become enlarged and pointed to make the Fangs. There are two varieties of fangs—open type and closed type in step with the character of the groove. In poisonous snakes, the labial glands became modified into poison glands and these don’t help them indigestion. The tongue is bifid at the apex. The left lung is reduced. The vesica is absent. Most snakes are terrestrial. Few are arboreal and aquatic.