Several species have been assumed to exist, but due to a lack of physical evidence they can only be regarded as potential species.
Hypothetical species are usually believed to be extinct.
They have caused confusion, as they may have been a separate species, a subspecies, an introduced species or a misidentification.
You can help Wikipedia by expanding it.This article relating to parrots is a stub.
You can help Wikipedia by expanding it.This animal-related article is a stub.