Metamorphosis is a process in which animals undergo extreme, rapid physical changes that occur within a particular time after birth. The result of metamorphosis may be a change to the organism’s entire bodily makeup, such as a change in the animal’s number of legs, its means of eating, or its means of breathing. Metamorphosis is also required for sexual maturity, as pre-metamorphic members of specific species are typically unable to mate or reproduce.
This process is undergone by most insects. Animals that undergo metamorphosis include fish, mollusks, and many other types of sea creatures which are related to insects, mollusks, or fish.
Metamorphosis is a miraculous process. The speed and extent of cell growth and differentiation is astonishing. The process of metamorphosis involves a re-activating of genes that allow animal cells to change from one cell type to another, and is triggered by hormones, which the animal’s body releases as conditions for metamorphosis approach. These hormones cause drastic changes to the functioning of cells, and even behavioral changes such as the caterpillar becoming a chrysalis.