Scientists unearth fossil of two-headed reptile

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Scientists have unearthed the fossil of a young, two-headed marine reptile that lived when dinosaurs sitll walked the Earth.The discovery, detailed in of the Feb.22 issue of the journal Biology Letters, marks the earliest known occurrence of a well-known birth defect, called axial bifurcation, in living reptiles. This double-noggin phenomenon occurs when an embryo is damaged and some body parts develop twice.