The windhorse rides on the back of a sparrow.

"The self-existing energy of basic goodness is called windhorse in the Shambhala teachings. The wind principle is that the energy of basic goodness is strong, exuberant and brilliant. It can actually radiate tremendous power in your life. But at the same time, basic goodness can be ridden, which is the principle of the horse. By following the disciplines of warriorship, particularly the discipline of letting go, you can harness the wind of goodness." Chogyam Trungpa, from Shambhala, Sacred Path of the Warrior