I recently checked out a book from the library, the Copenhaver translation of the Hermetica. The introduction is full of great stories from antiquity. Here’s one of them.
“In Sakkara, north of the Serapeion proper, archeologist’s have uncovered structures built for Thoth’s ibis, a lunar bird of the night, and also for the hawk of Horus, a solar daytime bird. In these buildings attendants of the sacred birds hatched, reared, venerated and eventually mummified them for burial in urns. The number of birds buried in the galleries of “the house of rest of the ibis” has been reckoned at four million or more, implying that perhaps ten thousand dead ibises were stacked in these corridors in each year of the four centuries when the Sakkara complex was active.”