Flying elemental mounts

Flying mounts that look like bald eagles. You find and collect elemental shattered stones, which you have to forge back together. Then you click on the bird to give it the elemental power in the stone. It can shoot that element from its mouth, and you can fly on it without a saddle. The elements would be: fire, water, earth, lightning, and ice. If you don't want any powers on your eagle, you can still use it as a normal type. You can remove the elemental stone from the eagle and switch it with a different one. When you start your world, you start with the eagle, and you have to feed it berries to tame it.