The beast of burden, which, covered in bells, twinkled like rain

The Atlas of Curiosities: Part 12
A simple encounter:  Coming over a mountain pass in the Karakorum, we heard a noise that recalled the formation of raindrops high in a cloud. Seeking its source, we came upon a young boy leading a cow that was completely covered in tiny bells.  Though we marveled at this quiet cacophony, we moved on without a word, as our host motioned for us to be still, and not ask questions.