Tens of centuries ago, animals were increasingly seen as sacred representation of gods in ancient Egypt. Pilgrims would often pay for the mummification of an animal, in return for divine favor or revelation. And so a lucrative industry began (made up of animal keepers, embalmers, priests, and laborers building the cemeteries and catacombs) and, over time, up to 70 million animals were carefully preserved — or so Ancient Egyptians thought.