Amphibians

Amphibians are the smallest group among vertebrates, with only 3,000 the number of species. Such as fish and reptiles, amphibians are cold-blooded. This means that amphibians can not regulate its own body temperature. To that end, amphibians need the sun to warm the body. Initially started amphibians living in the waters and make use of gill breathing. Along with the growth of lung and legs develop and amphibians can walk on land.

Amphibians are found worldwide except at the poles. They occupy a number of different habitats such as rain forests, ponds, and lakes. They also exist in the grassy area on the slopes of high mountains, even in the desert.

Although adult amphibians can survive for long periods of drought, its general they require moist places such as rivers and ponds. Region of humid tropical rain forests, many frogs can survive without a permanent water source. As cold-blooded animals, amphibians are not active in cold conditions. In this condition they do hibernate, usually in the mud at the bottom of the pool.

The crowd trouble distinguishing frogs and toads. In general, smooth-skinned frogs and more are in the water. Frogs and toads prey on insects and other small animals. They stay quiet place to wait for passing prey. Some species use a long, adhesive tongue to capture prey.

Amphibian breeding season often lasts a mess. Amphibians males and females gather together in large numbers. After an egg, usually no longer care for the eggs of amphibians. Only a few species of amphibians that protect the eggs. 

Largest amphibious salamander-like giant Chinese and cane toads are not a lot of enemies. Generally, a small amphibian species rely on camouflage or escape predators when threatened. There are also amphibians that rely on flashy skin to frighten the enemy.

There are types of amphibians that have poison. Poisonous frogs from South America has a striking color as a sign of danger predators. Very strong poison frogs 'poison' gold owned dart frogs from Colombia for example, can be killed around 1,000 people at once