Out in the barrens of western Montana, there is a rock shaped like a raven's head with half of the beak broken off. If you use your forearm to complete the beak and hold the position for seven minutes and 26 seconds, you will feel a tingling sensation in your arm. You must then get at least 1 mile away from the rock within the next 66 seconds.
If you do this, you will be able to shape shift into any bird at will.
If you begin the process and fail, you will turn into a crow and will never be able to return to human form.