What was the first Minecraft mob?

The first minecraft mob was the "Creeper," which was unintentionally created due to a coding error while the game's creator, Markus Persson (Notch), was trying to design a pig. This iconic creature has become synonymous with Minecraft, known for its green appearance and ability to explode when close to players. The Creeper's unique behavior and design have made it one of the most recognizable elements of the game.