Beak Disease
Beak Disease can be caused by not cleaning your humming bird feeder thoroughly. Mold starts to grow on feeders if you don't clean them thoroughly. And the hummingbirds with the disease get to the point where they can't fly or eat causing them to starve or be hurt by us or other animals. It's best to find a feeder that fully breaks down all of its pieces for easy cleaning.
This page is dedicated to Melody.