Why is it more common to see two heads on some species like turtles or snake than it is to see a two headed shark or lion?
In: Biology
It’s not all that uncommon in mammals.
The difference is that an under or overdeveloped animal is more capable of surviving cracking out of an egg than making it out of a living mother during vaginal birth.
This leads to more reptiles surviving, while mammals are much more likely to be miscarried or stillborn.
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