A dinosaur embryo was found in a fossilized egg at the Yingliang Stone Natural History Museum in China.

"Museum staff identified them as dinosaur eggs and saw some bones on the broken cross section of one of the eggs," Lida Xing of China University of Geosciences, Beijing, said in a news release.

Researchers acquired the fossilized egg from Lanzhou, Jiangxi province, in southern China in 2000 and placed it in storage for 10 years.

When construction on the museum began, museum staff sorted through the boxes of unearthed fossils.

“A embryo was found hidden within, which they named ‘Baby Yingliang,’” Xing said.

An iScience journal study found that the embryo is part of the theropod group of birdlike oviraptorosaurs. These dinosaurs took on a tucking posture, which is unique to birds, before hatching.

“This articulated specimen is one of the most complete non-avian dinosaur embryos yet discovered,” the study noted.

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The study stated that such a discovery is extremely rare, as skeletons of dinosaurs are not often preserved in their egg.