25 July 2014 Last updated at 02:19
By Pallab Ghosh
Science correspondent, BBC News
All dinosaurs were covered with feathers or had the potential to grow feathers, a study suggests.
The discovery of 150-million-year-old fossils in Siberia indicates that feathers were much more widespread among dinosaurs than previously thought.
The find "has completely changed our vision of dinosaurs", the lead researcher told BBC News.
The details have been published in the journal Science.
The creature, called Kulindadromeus zabaikalicus, was about 1m long, with a short snout, long hind legs, short arms, and five strong fingers.
Its teeth show clear adaptations for chewing plants.
Until now, fossilised evidence of feathery dinosaurs has come from China and from a meat eating group called theropods.
The latest discovery, in Russia, is from a completely separate group of plant-eating dinosaurs called ornithischians - which account for half of all dinosaurs.
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