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In page Anoa:

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Skulls of anoa cannot be accurately identified as to species, and there is likely hybridizing and interbreeding between the two in zoo populations.[citation needed] It is questioned as to whether the two species were different due to them occurring together in many different areas, as well as some interbreeding. A study of the mtDNA of ten specimens from different localities found a high mitochondrial genetic diversity between individuals identified as one or the other species, indicating support for recognition as two species.[1]