Primarily all woodpeckers eat insects. They will also eat fruit, acorns, and nuts.
Downy
Description - Smallest in this group
White back, black wings with white spots and black bars on its white tail feathers. Male has a small red spot on the back of its head
Hairy
Description - Same coloring as the Downy but slightly larger and a larger beak
Northern Flicker
Description - Brown barred back, spotted chest and under parts with a black crescent under the beak
Red Bellied
Description - Black and white barred back, white upper tail patch, male crown and nape of head is red, only the nape of the female is red
Pileated
Description -
Largest of woodpeckers in North America (up to 16 1/12" in length)
Mostly all black with white under beak, white line down neck to body, bright red cap to the back of head