It is a group of animals that belong to the vertebrate family, where these animals are distinguished by their ability to live in water and land. The name of amphibians is due to the Greek word meaning to live a double life, as 8100 species of living amphibians are known, and these animals appeared about 340 Million years during the Mississippi era, and these types of animals are frogs, salamanders, cecilia and other species, and these animals possess many characteristics including moist skin, as amphibians rely on skin breathing and have green eyes in order to distinguish shapes, and some types of these live Animals in stagnant water and lay eggs in the water while others are laying eggs under the female skin, and will explain more about these animals in this article.
Amphibians are among the animals that live in water and land. These animals place eggs in water or carry them by the female as eggs surround several membranes, and in the absence of these membranes the process of reproduction of amphibians requires water bodies, and these animals also tend to live in humid places and that Because of the preservation of her skin’s moisture, the world’s smallest amphibian animal, a frog, was discovered as it was first discovered in Guinea in 2012 and has an average length of 7.7 mm. Chinese salamander is one of the largest of these animals and has a length of 1.8 meters.
These animals are cold-blooded, in addition to a low metabolism rate and as a result, their requirements for food and energy are limited. The adult types of these animals also have tear ducts and moving eyelids. Muscle which can be prominent in many types, usually its ribs are short and can be combined into the vertebrae, its skulls are mostly wide and short, and the skin contains many mucous glands and in some types they are toxic glands.
Amphibians have hearts consisting of three chambers; two atria and one ventricle. They also have a urinary bladder that secretes nitrogenous wastes. These animals breathe through the gills, and gas can be exchanged through the skin.