Frog.

               Frogs are amphibians. Most frogs are characterized by a short body, webbed digits (fingers or toes), protruding eyes and the absence of a tail. Frogs are widely known as exceptional jumpers, and many of the anatomical characteristics of frogs, particularly their long, powerful legs, are adaptations to improve jumping performance. Due to their permeable skin, frogs are often semi-aquatic or inhabit humid areas, but move easily on land. They typically lay their eggs in puddles, ponds or lakes, and their larvae, called tadpoles, have gills and develop in water. Adult frogs follow a carnivorous diet, mostly of arthropods,(small insects).

 
                Frogs are most noticeable by their call, which can be widely heard during the night or day, mainly in their mating season. The distribution of frogs ranges from tropic to subarctic regions, but most species are found in tropical rainforests. Consisting of more than 5,000 species described, they are among the most diverse groups of vertebrates. However, populations of certain frog species are declining significantly.

Malagasy rainbow frog a sensible range of colors and can be found in rocky areas of dry forest of Madagascar's  Isalo Massif, where it breeds in shallow temporary pools found in canyons. This species is well adapted to climbing in its rocky surroundings, and can even scale vertical surfaces! When threatened, this frog will inflate itself as a defence mechanism against predators.

Crystal frog known by the scientific name Hyalinobatrachium pellucidum. We can see the inside of the body of this frog.this frog is found in humid tropical and subtropical mountains or revers.

Atelopus frog or known by another name,Costa Rica Variable Harlequin Toad. This frog can be found in Costa Rica and Panama only. The species is listed as critically endangered and is thought to be living primarily in Panama today.

Generally speaking, higher altitude means larger animals. But the world's smallest known frog species lives high in the Andes Mountains of southern Peru, between 9,925 and 10,466 feet.

The goliath frog or Conraua goliath is the largest extant anuran on Earth. It can grow up to 13 inches (33 cm) in length from snout to vent, and weighs up to 8 lb (3 kg). This animal has a relatively small habitat range, mainly in West Africa (near Gabon). The goliath frog can live up to 15 years. Goliath frogs eat scorpions, insects and smaller frogs. These frogs have acute hearing but no vocal sac.

As suggested by the name, the Red Mantella has an orange/red dorsal surface. These frogs are small, reaching a size of 2.5 centimetres (1 in) in length. It is is a small, terrestrial frog native to Madagascar.

Poison dart frog, like this sapphire-blue species, is the common name of a group of frogs in the family Dendrobatidae which are native to Central and South America. Unlike most frogs, species are active during the day, and often exhibit brightly-colored bodies. Although all dendrobatids are at least somewhat toxic in the wild, levels of toxicity vary considerably from one species to the next, and from one population to another. Many species are critically endangered. These amphibians are often called "dart frogs" due to indigenous Amerindians' use of their toxic secretions to poison the tips of blowdarts. 

The ornate horned frog can grow up to six inches long and inhabits Uruguay, Brazil, and northern Argentina. While it may look like a lifeless pincushion, it's quick to lunge when lizards, small rodents, birds, or other frogs blunder by.

 The Chile Darwin's frog was fairly regularly seen until around 1978, since when it seems to have disappeared, and the species may now be extinct. This species, which lives in the leaf litter on the forest floor, has an unusual method of parental care; the male takes the fertilised eggs from the nest into his vocal sac where they hatch into tadpoles after approximately eight days. When he starts to feel the newly hatched tadpoles wriggling, the male carries them to a stream where he expels the young. Here they complete metamorphosis.

Theloderma corticale, or the Vietnamese mossy frog, is a species of frog in the Rhacophoridae family. It is found in Vietnam and possibly China. Its natural habitats are subtropical or tropical moist lowland forests, intermittent freshwater marches, and rocky areas. The common name of the mossy frog arises from the fact that its skin is a mottled green and black that resembles moss growing on rock, and forms an effective form of camouflage.