Why does poisonous snake horn grow

Clawed limbs 

The lizards have adapted to the land considerably better than the frogs or the tailed amphibians. The limbs of a lizard are attached to the side of the body compared to a mammal. The limbs with strong claws are a typical feature of lizards and other reptiles.Horn scales and armor 

The skin of the reptiles, which is covered with hard-wearing horn scales, is an effective protection against evaporation compared to the thin, moist skin of the amphibians. The horny scales in snakes and lizards do not grow back, however, so as soon as a new skin has grown back under the old one, they shed their old skin and shed their skin.Crocodile bite 

The formation of teeth is another typical feature of reptiles. This makes it possible to hunt larger prey on land and in water. The teeth of the crocodile - and also of the snake - are not used for chewing, but for grasping and holding on to the prey.
   
 Labial pits and olfactory organs of snakes 

Venomous snakes have a sophisticated system of sensory organs for tracking down their prey. In the ball python there are labial pits on the lips, which are interspersed with heat-sensitive skin nerves. This enables the python to recognize warm-blooded animals even in the dark. Another sensory organ of the snake is the split tongue and the Jacobson's olfactory organ located in the palate.Improved respiratory system 

The reptiles breathe through the lungs, the inner surface of which is significantly larger than that of the amphibians due to folds and chambers. Therefore, reptiles do not need skin breathing. Nevertheless, they are cold-blooded like amphibians, in contrast to mammals and birds. In the reptilian heart, the left and right ventricles are not yet completely separated, while in the amphibian heart a septum is completely absent.