StorminNorman t1_ivng8p1 wrote
Reply to comment by gluhur in Two-headed sharks are sighted more and more and no one knows why. by [deleted]
"are reptiles or amphibians"
That's a pretty large group of animals. As it is, two headed animals can be found in a lot of different animals, it is rare though, and usually fatal. Extra limbs is also a thing, for more info, look into the hox gene and how its expression drives development.
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