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Hypothetical species
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.[1]
- ^ Fuller, Errol (1987). Extinct Birds. Penguin Books (England). p. 131. ISBN 0-670-81787-2.
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