|summary=Hilarious rhyming tale that really does answer the question of the title. Recommended.
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|aznus=1407135724
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You might be wondering why anyone would want to stack anything on the back of a yak, but the answer is simple. In this adorable tale, Captain Quack and the Yak (you’ve guessed it, this is a rhyming one) deliver post to the top of a mountain. Along the way the Yak likes to play, and, well, deviate from the track, and no matter how hard he tries, Captain Quack cannot control him. Uh oh. One day, the Yak ends up with a rather more interesting load than his usual parcels and boxes and sacks.