A hole in an ancient cow’s skull could have been surgery practice
People may have been testing surgical techniques before operating on humans
![ancient cow skull](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/04/041818_BB_cowcut_feat.jpg?fit=860%2C460&ssl=1)
HOLEY COW A section of bone missing from the right side of a more than 5,000-year-old cow skull (front and back views, shown) resulted from a surgical procedure, researchers say.
F. Ramirez Rozzi