In Conker's Bad Fur Day, the Z Button is the game's trigger button. When Conker has a weapon equipped, such as the Shotgun or Submachine Gun , pressing the Z button fires the weapon. In Multi mode, the Z button is used for all weapons. When a weapon is not equipped, the Z button is also used to crouch. Moving while crouching causes Conker or any other character to crawl. Pressing A while crouching causes Conker to do a high jump.
In Conker: Live & Reloaded, the Right Trigger is the game's firing and crouching button.