Blood monkey

BloodMonkey is the supposed name of a character from the canceled Action Adventure title in development by Retro Studios, which later partially evolved into Metroid Prime.

Some artwork in Prime of environmental features frequently use the word "monkey" to describe rooms, for example, "monkey lair" (Burn Dome), and call the Incinerator Drone "monkey_Flamethrower". Its theme music is also called "rui_monkeylower" in the game's files. While it could be a holdover, it is also possible (but unlikely) that it means some level design survived into Prime.