Rare's unreleased Dinosaur Planet for Nintendo 64 is now in the wild, and gameplay of it running on the console is available.
The video game preservationists at Forest of Illusion announced they had released a build of the game dated December 2000. Dinosaur Planet eventually launched as Star Fox Adventures for the GameCube in 2002.
Digital Foundry's John Linneman has confirmed the validity of the build, and managed to get it running on an actual Nintendo 64. The video below is gameplay he captured: