Most of the two headed animals I see are turtles. Is there a reason why they are more common than other two headed animals, or is it just a coincidence?

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Most of the two headed animals I see are turtles. Is there a reason why they are more common than other two headed animals, or is it just a coincidence?

In: Biology
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The main reason from what I understand is that, for a turtle/tortoise, they tend to live a very long time, and so two-headed animals in zoos tend to live ages and outlive other animals with two heads, meaning there’s a lot of living two-headed turtles in captivity. There’s nothing about turtles or tortoises that make it more common (someone please correct that if I’m wrong).

It’s actually observed more often in livestock, as we breed them far more often. However, livestock doesn’t tend to live that long as is, and many deformed animals don’t survive.

Two headed turtles can actually survive, most of the other animals die very early on in their life or even before they hatch or are born.