Reptiles are the animals which have four limbs crawling on their belly.
Some of them like snakes have no limbs which others like crocodiles float in water.
These reptiles are thought to have evolved from amphibians.
They are egg laying animals and nurture the eggs and rise the offspring.
They are mostly carnivorous in nature. But some of them are even herbivores.
They having varying life span like few months to even hundred years.
They have a four chambered heart and scaly skin with prominent teeth. See a detailed list of characteristics of reptiles
List of Reptiles
Tortoises & Turtles.
1. Snakes: These are animals which have a long and cylindrical body without any limbs. There are vast number of species of snakes. Some of them live in water and seas while other types are terrestrial.
They are fearful animals due to presence of poison in their salivary glands. When in trouble, they try to protect themselves by biting and injecting poison into the enemy body. This poison in most cases is deadly and can kill the animal or person.
Not all snakes are poisonous and in fact most snakes are non-poisonous. Especially the freshwater snakes are not poisonous. While those of marine and oceans are deadly poisonous. The poisonous snakes have two fangs a pair of modified canine teeth. Hence a bite of poisonous snake shows two punctured wounds. While that of non-poisonous snake shows many bites.
Interestingly some snakes like anacondas are so gigantic. They can swallow even large animals including humans. Other snakes feed on frogs, rodents, birds and other mammals.
Crocodiles and alligators: These are large lizard like reptiles. They live in fresh water like river, ponds etc. They are carnivorous in nature.
They can be of few centimeters to meters in length. They can move on land and tend to stay on land for short time. They are fast swimmers and very dangerous when in water.
These are typically small lizards which live in the human residences, trees, bushes and in burrows. They resemble crocodiles in appearances but have small scales on their bodies. Their teeth are also not prominent as crocodiles. They eat insects and other small worms.
Their specialty is in their ability to cling to the walls and other erect surfaces. Their legs have suction pads by which they can adhere to the erect and smooth surfaces without falling down. Also their tails act as an organ of safety. They wag their tail at the appearance of any threat. When the predator holds the tail first, they detach from tail and escape away. The detached tail still makes movement to keep the predator focused on it and the lizard escapes. The lizards can grow their tail latter.
Komodo dragons: These are large lizards and having thick skin. Their distribution is restricted to few countries like Indonesia.
Their bite is toxic and have powerful teeth. Unlike lizards, they attack and eat birds, deer and other mammals. They are good hunters and carnivorous in nature. Their venom is thought to prevent blood clot, cause hypo-tension and even unconsciousness when bitten by them. They grow up to few meters in length and are very active in movement.
Tortoises: These are the reptiles which live on land or water. Tortoises live on land while turtles live in water. These animal have longest live span and are recorded to have lived for 200 years. They are egg laying animals and hatch them on land.
They have a strong cover or case which protects them from predators. They are mild animals and are herbivores. Tortoises eat grass, flowers, weeds etc. while turtles also eat aquatic plants, they can also feed on insects, snail and other small animals.
These are extinct reptiles and thought to have lived thousands of years ago on the earth. These dinosaurs are largest animals ever lived on the earth.
Some of them were herbivores while other were carnivores. Few species among them are believed to have had an ability to fly.
Reference: Biology by Campbell.