I have photographed two Yellow-bellied Sapsuckers (Sphyrapicus varius), an adult female and a juvenile. In the second photo, the holes in the bark the female is creating can be seen.
Yellow-bellied Sapsucker (female), Chapel Hill, North Carolina, USA, December 5, 2007
Yellow-bellied Sapsucker (female), Chapel Hill, North Carolina, USA, December 5, 2007
Yellow-bellied Sapsucker (juvenile), Weymouth Woods Sandhills Nature Preserve, Southern Pines, North Carolina, USA, November 28, 2009