Cryptozoology is not a recognized branch of science or zoology, but is considered to be a pseudoscience. However, the study is a necessity for those animals whose existence has not yet been proven, animals that are considered extinct, or those who are mentioned in myths and legends but do not have any scientifically recognized evidence of existence. Cryptozoology will also encompass the study of misplaced animals, or those animals that are appearing where they should not be.