"A Wolf in Sheeps Clothing"
(Appearances are deceptive)
Aesop's Fables goes thus:
A Wolf found great difficulty in getting at the sheep owing to the vigilance of the shepherd and his dogs. But one day it found the skin of a sheep that had been flayed and thrown aside, so it put it on over its own pelt and strolled down among the sheep. The Lamb that belonged to the sheep, whose skin the Wolf was wearing, began to follow the Wolf in the Sheep's clothing; so, leading the Lamb a little apart, he soon made a meal off her, and for some time he succeeded in deceiving the sheep, and enjoying hearty meals.
As often happens in nature, symbiotic relationships develop that are beneficial to one species or the other. Here, you see the results of science, not to mention good taste or sound reason, run amok. In this hybrid miscegenation, the Wolf seems to have gained a bit more benefit from this particular combination than has the sheep. Some might argue unfairly so. (But when one stops to think, nature wouldn't have designed the Wolf if he-she-him-her-it-they didn't want fewer sheep grazing the land).
This Wolf in Sheep's clothing, though, takes it to the far reaches of fairness in the predator/prey balance of nature.