Oxford University scientists led team discovered bony tails radical shortening enabled earliest birds to develop versatile legs

An image of fossil birds from the time of dinosaurs [left image: Eoenatiornis, right image: Hongshanornis] showing they had diverse types of leg [credit: Roger Close]

An image of fossil birds from the time of dinosaurs [left image: Eoenatiornis, right image: Hongshanornis] showing they had diverse types of leg [credit: Roger Close]

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