They have more feathers per square inch than any other bird. They have no down feathers. Many feathers are iridescent and require sunlight to show colors. Hummingbirds do perch, they don't walk. Their feet seem to have no function beyond perching and scratching themselves.
Hummingbirds fly with their hands .
The upper arm and forearm bones are very short, and the elbow and wrist joints can't move. The shoulder joint to which the wing attaches can move in all directions plus rotate about 180 degrees. Hummingbirds don't flap their wings, they fly with their hands. Hummingbirds fly with their bodies held upright, not flat like most birds. Mix 1 part regular table sugar to 4 parts water.