What is it - biological definition
Metamorphosis in zoology are noticeable anatomical changes that occur during the life span of some animals.
In the case of complete metamorphosis, there is a clear difference between the different states through which an animal develops.
Summary of the metamorphosis phases
In the first phase, an embryo is formed within an egg. When the egg hatches, the resulting animal state is called the larva.
Subsequently, the larva becomes pupa (the phase the animal goes to transform). At the end of the pupa state the adult specimen appears.
Animals that thrive in this way include many types of fish, mollusks, and insects. In the case of incomplete metamorphosis, young people are similar to adults, and their shape gradually changes through skin exchange. For example, grasshoppers go through three phases without having a pupa period.
Frogs go through a different kind of metamorphosis. In the case of this species, from the egg comes a tadpole that lives in water, breathes through gills and has a tail. When the tadpole develops, its lungs and paws are formed, at this stage the gills and tail are reabsorbed by the body. Lastly, the animal leaves the water to live mainly in the land like an adult frog.
The four stages of butterfly metamorphosis.