And now I present you with a video I digiscoped (or digivideoed) of a black-capped chickadee eating a black oil sunflower seed. Note how it works the nut meat apart bit by bit. Also, note how this bird is not eating at a feeder, chickadees fly away to another perch with their food--presumably to eat it out of a potential predator's view.

When you see the chickadee puff up in the video, another chickadee has landed nearby, and it's trying to look intimidating to protect its food--it's a mini mantle.