Mammoth donkeys, also known as Mammoth Jackstock, are a breed of donkey that originated in the United States. They were developed in the 19th century by crossing Spanish donkeys with American donkeys and Mammoth donkeys to create a larger, stronger animal. These donkeys are known for their impressive size, often standing over 14 hands tall, and their gentle temperament. Mammoth donkeys are primarily used for work and as companion animals. They are valued for their strength and endurance, making them suitable for tasks like pulling carts and carrying loads. Their friendly nature also makes them popular in farms and as family pets.