In 1967, a chultun was discovered at Chichen Itza with skeletal remains of over 100 children. Now, DNA from 64 remains has provided insights into child sacrifice practices. Researchers found that entombed were all boys, including siblings and twins, aged three to six. Most were sacrificed during Chichen Itza's peak (800-1000 AD), spanning a 500-year period, ending around 1100.