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An international team of scientists discovered a cache of dinosaur embryos near the city of Lufeng, in Yunnan, China. Estimated to be 190 million years old, the fossilized bones are among the oldest dinosaur embryos in the world. In undated photos, embryonic humerus, as it is preserved in the sediments, is seen at right, and a preserved thigh bone is seen in cross section at left. The purple color is caused by the lamba filter used for effective visualization. The honeycomb like external area is embryonic bone tissue with large primary spaces for blood vessels, bone making cells called osteoblasts, and other soft tissues needed for growth. The central portion is the medullary cavity, in this case filled with crystals that formed during fossilization. (Photo by University of Toronto)
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