A Lizards Tail

A Comon Lizard (Zootoca vivipara) on a boardwalk at Strumpshaw Fen, Norfolk, England. If caught by the tail it will snap off at a joint near the base leaving the predator holding just the tail which continues to wriggle after separation. Amazingly, it can grow another which is usually shorter and thicker. This one seems to be contemplating whether or not this is true.
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