From my walk the other day, this male yellow-bellied sapsucker displays his name-sake feature. The yellow belly is not always easily visible.

My favorite picture taking birds are the woodpeckers. This yellow-bellied sapsucker bangs away on a dead tree trunk with a rapid and loud bang-bang-bang! They should call him a “yellow-bellied jack hammer!”
I hear him from a quarter-mile away and, after tromping through the underbrush, I get within 20 yards of him. He doesn’t care. He keeps pounding away and I get to take as many images as I want.