Chapter 1: “Once, in the olden days of pure prehistory…”
Once, in the olden days of pure prehistory, there was a caveman who liked to eat fish.
He only knew that he liked it because, once, when he was very young, the spirits punished his tribe for not obeying their rites and stopped up the mouth of the river.
It sank until it was just a little stream, then mud. He walked around the flapping fish and marveled at their resilience. Then most of them stopped moving. He took one home and cooked it on the fire, and he and everyone else liked it.