The tiny fossil, nicknamed the "wonderchicken," includes a nearly complete skull hidden inside nondescript pieces of rock, and dates to more than 66 million years ago.
That's less than 1 million years before the asteroid impact that killed off all the large dinosaurs.
"The moment I first saw what was beneath the rock was the most exciting moment of my scientific career," said study lead author Daniel Field of the University of Cambridge in the U.K. in a statement.
To read more on this story, click here: Oldest Bird Fossil Discovered, Nicknamed 'Wonderchicken'
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