User blog comment:Eryk.danielak.5/Organising categories/@comment-2236231-20170630032742

There are people interested in the source of a species portrayal, and when their first appearance isn't noted in the article such categories assist us in hunting down the source material. Additionally categories like Movie Species allows us to eventually create categories like 'Movie Species of the 1950s'- which will prove useful to anyone doing a study on depictions of Aliens in Science Fiction Films of the 1950s. Such research proves useful in social studies, media history, and in creating new media inspired by how the past saw the future (this is known as Retrofuturism).