Most "Turkey mods" replace standard game assets (like the "Andromeda" plane, a vehicle, or even CJ’s model) with a giant, often low-poly turkey. Some versions add a turkey as a drivable vehicle, a weapon that shoots turkeys, or replace pedestrian models with turkeys.
In Turkey, these mods became so popular that they were often sold as standalone "unofficial" games in local computer shops during the 2000s. Cyber Cafes gta san andreas turkey mod
