Tail-walking dolphins hint at "culture..."

A wild dolphin is apparently teaching other members of her group to walk on their tails, a behaviour usually seen only after training in captivity. 

The tail-walking group lives along the south Australian coast near Adelaide. 

One of them spent a short time after illness in a dolphinarium 20 years ago and may have picked up the trick there. 

Scientists studying the group say tail-walk tuition has not been seen before, and suggest the habit may emerge as a form of "culture" among this group. 

"We can't for the life of us work out why they do it," said Mike Bossley from the Whale and Dolphin Conservation Society (WDCS), one of the scientists who have been monitoring the group on the Port River estuary. 

"We're doing systematic observations now to determine if there's something that may trigger it, but so far we haven't found anything," he told BBC News. More...

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