Did you know the Thunderbird was an actual animal?
Its heyday was in the Pleistocene. It was the only Terror Bird that could fly. It had a fourteen-foot wingspan and the only way it could get aloft is on thermals that sprung up in the vanguard of major weather systems — the First Nations had it bass-ackwards, the Thunderbird didn't bring the storm, the storm brought the Thunderbird.
Before Clovis Man happened on the scene, it was the bison's primary natural predator; it preyed on bison, and not just the calves, either. Bison herds would see this thing and run like all hell's fury was after them. Humans learnt to watch for stormclouds to go hunting because stormclouds = thunderbirds flying = bison running for it. And the Thunderbird was definitely <i>not</i> averse to picking off the occasional human hunter, either.
Great idea for a camp!