The twenty-two species of woodpeckers
found in the US are from one family, Picidae. They all spend
a lot of time on trees but some of them also gather food
from the ground or by chasing insects in the air.
Swifts are very different from
swallows. Swallows are in the songbird order while swifts
are recognized as being related to hummingbirds.
Hummingbirds are found only in the New World, while swifts
are found throughout the world.