All amphibians begin their life in water with gills and tails. As they grow, they develop lungs and legs for their life on land.
Amphibians are cold-blooded, which means that they are the same temperature as the air or water around them.
There are more than 4,000 different kinds of amphibians. Members of this animal class are frogs, toads, salamanders, newts, and caecilians or blindworms
The three modern orders of amphibians are Anura (the frogs and toads), Urodela (the salamanders, Newts), and Apoda (the caecilians or blindworms). The number of known amphibian species is approximately 7,000, of which nearly 90% are frogs. The smallest amphibian (and vertebrate) in the world is a frog from New Guinea (Paedophryne amauensis) with a length of just 7.7 mm (0.30 in). The largest living amphibian is the 1.8 m (5 ft 11 in) Chinese giant salamander (Andrias davidianus), but this is dwarfed by the extinct 9 m (30 ft) Prionosuchus from the middle Permian of Brazil. The study of amphibians is called batrachology, while the study of both reptiles and amphibians is called herpetology.
1. Frog
2. Salamander
Members of the family Salamandridae are mostly known as newts and lack the costal grooves along the sides of their bodies typical of other groups. The skin of some species contains the powerful poison tetrodotoxin; these salamanders tend to be slow-moving and have bright warning coloration to advertise their toxicity. Salamanders typically lay eggs in water and have aquatic larvae, but great variation occurs in their lifecycles. Some species in harsh environments reproduce while still in the larval state.Salamanders rarely have more than four toes on their front legs and five on their rear legs, but some species have fewer digits and others lack hind limbs. Their permeable skin usually makes them reliant on habitats in or near water or other cool, damp places. Some salamander species are fully aquatic throughout their lives, some take to the water intermittently, and others are entirely terrestrial as adults. They are capable of regenerating lost limbs, as well as other damaged parts of their bodies.
Fire Salamander
Spotted Salamander
Coastal Giant Salamander
Marbled Salamander
The marbled salamander is a species of mole salamander found in the eastern United States.
Newt
Salamander
Tiger Salamander
X-ray image of salamander
Aquatic Salamander
Olm - Aquatic Salamander
Sirens
Have an eel-like appearance. Siren is a genus of aquatic salamanders of the family Sirenidae. The genus consists of two living species, along with one extinct species from the Eocene Epoch and three from the Miocene.
Hellbender
The hellbender, also known as the hellbender salamander, is a species of aquatic giant salamander endemic to eastern North America. 
Axolotl
Showing external gills
The axolotl also known as a Mexican salamander or a Mexican walking fish, is a neotenic salamander, closely related to the tiger salamander. Although the axolotl is colloquially known as a "walking fish", it is not a fish, but an amphibian.
3. Caecilians
Caecilians are a group of limbless, serpentine amphibians. They mostly live hidden in the ground and in stream substrates, making them the least familiar order of amphibians.
Ichthyophis
Ichthyophis is a genus of caecilians (limbless amphibians, sometimes called the Asian caecilians) found in Southeast Asia, the southern Philippines, and the western Indo-Australian Archipelago.
Eocaecilia, the earliest known caecilian
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