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The tail of a feathered dinosaur has been found perfectly preserved in amber from Myanmar.

The one-of-a-kind discovery helps put flesh on the bones of these extinct creatures, opening a new window on the biology of a group that dominated Earth for more than 160 million years.

Examination of the specimen suggests the tail was chestnut brown on top and white on its underside.

The tail is described in the journal Current Biology.

“This is the first time we’ve found dinosaur material preserved in amber,” co-author Ryan McKellar, of the Royal Saskatchewan Museum in Canada, told the BBC News website.

The study’s first author, Lida Xing from the China University of Geosciences in Beijing, discovered the remarkable fossil at an amber market in Myitkina, Myanmar.

The 99-million-year-old amber had already been polished for jewellery and the seller had thought it was plant material. On closer inspection, however, it turned out to be the tail of a feathered dinosaur about the size of a sparrow.

Lida Xing was able to establish where it had come from by tracking down the amber miner who had originally dug out the specimen.

Dr McKellar said examination of the tail’s anatomy showed it definitely belonged to a feathered dinosaur and not an ancient bird.

“We can be sure of the source because the vertebrae are not fused into a rod or pygostyle as in modern birds and their closest relatives,” he explained.

“Instead, the tail is long and flexible, with keels of feathers running down each side.”

Dr McKellar said there are signs the dinosaur still contained fluids when it was incorporated into the tree resin that eventually formed the amber. This indicates that it could even have become trapped in the sticky substance while it was still alive.