BBC: 'Sex' drove fossil animal traits

Several prehistoric creatures developed elaborate body traits in order to attract members of the opposite sex, according to new research.

The purpose of the exaggerated crests and sails found in many fossil animals has long been controversial.

Some scientists said sails helped to regulate body temperature and that head crests helped flying reptiles steer during flight.

Now a study say these traits became so big because of sexual competition.

The findings, by an international team of researchers, is published in the journal American Naturalist.

One of the prehistoric animals looked at by the researchers were pterosaurs - flying reptiles which became extinct at the time of the dinosaurs.

The study suggests the relative size of the head crest compared to the body of the pterosaur was too large for it to have been dedicated to controlling the animal's body temperature or its flight.

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