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Two-headed Reptile Fossil Found in China
[TheBORG] writes "A tiny skeleton from the Early Cretaceous shows an embryonic or newborn reptile with two heads and two necks, called axial bifurcation ('two-headedness') (a well-known developmental flaw among reptile species today such as turtles and snakes) was found in China by French and Chinese paleontologists recovered from the Yixian Formation, which is nearly 150 million years old."
Dual-headed miscreants are also common with amphibia (frogs, newts), not only with reptilia. But because amphibia are often prey to a lot of predators, the dual-heads don't survive very long. An interesting exception is the site of the Tchernobyl nuclear plant, where after the nuclear catastrophe in 1986 most of the predators have left, and now the nearby lake shows miscreated newts and frogs more often. It's not because of the background radiation (it's back to normal levels at least in the lake), but because of the lack of predators that those animals survive so often.