The Old Bird (or RadMech in the game files) is an entity in Lethal Company. Old Birds are humanoid, mech-like entities, often spawning on 5-Embrion and 68-Artifice. They appear as tall, walking robots with a large spotlight on their head.

Old purpose-built weapons of war, these entities are armed with ranged weaponry. Coupled with the ability to fly, and several different offensive capabilities, makes the Old Bird a hazardous threat to employees when active.