Bohaiornis guoi's stomach helps build a rough timeline of how the quartz was fossilized." data-has-syndication-rights="1" height="1470" src="https://www.popsci.com/resizer/SYObRwOLliGBC0H6R7jHuHyHayk=/cloudfront-us-east-1.images.arcpublishing.com/bonnier/XIW4VCBVTNAMJMZ2NXWX3IWMIQ.jpg" width="2000"/>An X-ray of the crystals preserved in the Bohaiornis guoi's stomach helps build a rough timeline of how the quartz was fossilized. (Liu et al, IVPP/)If you went back in time 120 million years, the majority of the birds flying overhead would be part of the now-extinct group known as Enantiornithes. These creatures looked a lot like the visitors at our feeders today, but with toothy smiles and claw
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