frogs are insect-eating amphibians living in fresh water or on land, smooth-skinned, green or red-brown, longer hind legs, good at jumping and swimming.
The perfect metamorphosis of frogs begins with eggs, tadpoles, young frogs that later become adult frogs.

Frog metamorphosis process

Generally the order of metamorphosis of frogs there are 4 phases namely: egg phase, velvet phase phase young frog and the last phase of adult frogs. Here's an explanation of metamorphosis in the complete frog:

1. Phase of Frog Eggs
As in the metamorphosis of butterflies and all living things that metamorphose the first phase is the egg. When the fruiting season of the female frog will release a lot of eggs in the water, after which the male frog will fertilize the egg, This is called external fertilization.
External fertilization is very vulnerable to failure, Many factors that affect such a strong water flow, the presence of predators in the form of fish and other disorders. Frog eggs are often found in a group situation, they are united by a kind of jelly that protects the egg. For tree frogs generally they lay eggs on branches of trees, The outer shape resembles foam to protect eggs from the sun's heat, Eggs frogs will hatch into larvae after 21 days.

2. Fungus tadpole phase

The tadpole or frog tadpoles will be around the eggs to eat the remains of the food from the shell until the body functions grow and allows to feed themselves, Tadpoles will make the formation of gill organs, tail and mouth until the body is perfectly formed. Until the age of one week tadpole organ has been formed perfectly and ready to feed themselves, At first gill tadpole is on the surface of the skin. When it reaches the age of 4 weeks the gills will be covered by the skin so the gills will enter the body and disappear slowly.

For 6 weeks, in the process of metamorphosis of frogs, tadpoles will continue to change the physiological functions of animals and their morphological form. Her hind legs began to grow and then followed the growth of the forelegs. Likewise the internal organs, lungs began to develop before finally go to the next stage. Young frog, In the period of 6 weeks to 9 weeks will begin to look head shape and body slowly began to elongate. Tadpole food at this time in the form of dead insects found in the waters.

3. Phase of the young frog
the young frog as one of the metamorphosis stages of the frog.
This phase begins at week 12, After experiencing the growth process, tadpoles begin to experience the growth phase. Changes in shape, gills disappear, frog's tail shortened, mouth widened, and newly formed lungs began to function. Young frogs have begun to engage in the mainland and begin to leave the waters, In addition, the frog digestive system will be adapted to be carnivores, insectivorous eaters. In this phase only lasts for about 3 weeks, until the perfect young frog becomes an adult frog.

4. Adult frog phase
By the 16th week the frog is perfectly formed, the adult frogs no longer have the gills and changed into the lung, the shape is much different from the velvet, it has no tail anymore. Adult frogs have strong, webbed feet between each finger, adult frogs no longer live in water They will only go to the waters during fertilization. And then again the recycling process of frogs.

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