Scientists have found what is thought to be the first example of a two-headed reptile in the fossil record.

The abnormal animal, belonging to a group of aquatic reptiles, was unearthed in northeastern China and dates to the time of the dinosaurs. The specimen reveals that it must have been very young when it died and became fossilised, says lead researcher Eric Buffetaut. Details of the fossil appear in the UK Royal Society journal Biology Letters.

This animal was a choristoderan, an extinct reptile that reached a length of one metre in adulthood and was characterised by a long neck - two in this case. The animal?s spinal column divided in two at the point where the neck emerges from the body. This formed two long necks that ended in two skulls. Choristoderans seem to have been common aquatic reptiles during the Cretaceous Period (144 to 65 million years ago) in what is now northeastern China.