Donkeys come in various breeds, each with unique characteristics. The most common breeds include the American Mammoth Jackstock, known for its large size and strength, and the Miniature Mediterranean Donkey, which is small and friendly. Other notable breeds are the Standard Donkey, often used for work, and the Poitou Donkey, recognized for its long hair and rarity. These breeds are categorized based on size, purpose, and origin. For example, the Spanish Donkey is valued for its endurance, while the Sicilian Donkey is known for its gentle temperament. Each breed plays a role in agriculture, companionship, and conservation efforts.