Although exclusive female homosexuality is extremely rare in the animal kingdom, scientists have spotted some instructive exceptions. https://link.springer.com/article/10.1007/s10508-018-1261-0 …pic.twitter.com/Otwh5nLSkZ
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I'd think, given the fact that such behavior have been observed only in isolated cases, and not on a regular basis, as in humans, makes them assume it is abnorm outlier.