The term 'Beast of Burden' can be broken down into six letters, BURDEN, three letters, ASS, five letters, LLAMA, three letters, APE, and three letters, YAK. The Beast of Burden is a phrase used to describe an animal that is used to carry heavy loads or perform laborious tasks. This phrase is often used to refer to animals such as donkeys, mules, horses, camels, llamas, yaks, and apes. These animals are often used in agriculture, transportation, and other labor-intensive activities.