The first stay at home dads?

Many dinosaurs played an active role in nurturing their eggs and raising their newborns, according to a study published Friday in Nature. A team of scientists, led by paleontologist David J. Varricchio at Montana State University at Bozeman, examined the dinosaur bones found near egg clutches. The scientists found that none of the dinosaur skeletons contained the medullary bone, a bone found only in female dinosaurs. They also looked for signs of calcium or phosphorus, byproducts of the egg-laying process, but found none.

Birds, the closest surviving relative to dinosaurs, also share parenting responsibilities between males and females. The findings were reported in this article in the Los Angeles Times.