parrotfish  change appearance  throughout  three lives they charge color os they grow up . parrotfish are dazzling in their  appearance   but deadly in their lifestyle  they dig at coral with their  though mouth which are like like beaks and grind it up in their  throats. This release  the zooxanthellae  that are on important part of their diet. The stony parts of their  pass through their bodies coming  out  the other end as  beautiful white sand. from called book wild abut oceans