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Uudelleenmuuttuminen, also known as metamorphosis, is a biological process by which an animal physically develops after birth or hatching, involving a profound transformation from its larval stage to an adult form. This process is characteristic of insects, amphibians, and some other invertebrates. The term "metamorphosis" comes from the Greek words "meta" meaning "change" and "morph" meaning "form."

Metamorphosis can be categorized into three main types: complete, incomplete, and gradual. Complete metamorphosis, seen in insects like butterflies and beetles, involves four distinct stages: egg, larva (often called a caterpillar), pupa (chrysalis), and adult. Incomplete metamorphosis, found in insects such as grasshoppers and cockroaches, involves fewer stages, typically egg, nymph, and adult. Gradual metamorphosis, observed in amphibians, involves a more continuous transformation from a larval stage (tadpole) to an adult form (frog or toad).

The process of metamorphosis is regulated by a complex interplay of genetic and environmental factors. Hormones play a crucial role in triggering and controlling the various stages of metamorphosis. For example, the hormone ecdysone is involved in the molting process, which is a key part of metamorphosis in insects.

Metamorphosis serves several evolutionary purposes, including adaptation to different environments, increased survival rates, and the ability to exploit new food sources. It allows organisms to optimize their growth and development, ensuring they reach maturity in the most efficient and effective manner possible.