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.
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