A hummingbird helmet is a helmet with a hummingbird feeder attached to attract hummingbirds to your face. Think of it as similar to a Bear Vest, which is a vest made of beefsteaks to attract bears.
Spencer Staley goes all-out with a total of seven feeders hanging from rods extending from a helmet.
I really don't see why, with proper supports, it wouldn't be possible to build a helmet with ten times as many supports. I mean, humans went to the Moon and invented Twitter. A hummingbird helmet with seventy feeders is within our potential.
-via Born in Space