In Wydin's shop in Port Sarim there's a crate that provides unlimited raw chickens. A white apron is required to enter the room which contains the crate.
These are popular amongst new players, since any player can attempt to cook them (although players with low Cooking levels risk producing a burnt chicken). Chickens are also found around Lumbridge, and are easy to kill.
At level 32 Cooking, players stop burning chickens.
Use in Quests
During Recipe for Disaster, a player needs a raw chicken to access the lair of the evil chicken. The player needs the raw chicken to access the lair even after the quest. This allows a player to fight black dragons and baby black dragons.
Raw chicken is also needed in Druidic Ritual.