There are three types of pewees native to North America. The Eastern Wood-Pewee and the Western Wood-Pewee are the most common and have the largest ranges. The Greater Pewee, as the name indicates, is the largest pewee member of the pewee family and is found mainly in southern Arizona in the warmer months. The Cuban Pewee is a rare vagrant that has been reported seen in the southern states.
The pewees are members of the flycatcher family. These birds are mostly seen in forests, feeding on insects, catching them in flight or picking them off leaves and the bark of trees. The pewees are drab-looking birds whose plumage is a dull grey with light yellows and dull greens, which makes them a difficult bird to identify by sight. Their calls are usually a better indication of the species of the bird.
Avibase - the world bird database This site provides the user with a complete list of bird species, broken down per country, or in the example of the US or Canada, per state and province. Here, bird species names are available in other languages, a great asset to be used as a translation of foreign bird names.
ABA - American Birding Association This site represents an organization that maintains official records of all birds species that have been proven to have been seen inside the perimeters of the North American Continent and the surrounding bodies of water. Regular revised versions are posted to keep the bird list current at all times. This is the list used by all serious birders over their lifetime. You may be aware of the movie called the "Big Year". It was with this list that all the competing birders used in an attempt to set a new record as to how many bird species that could be seen by an individual birder in one calendar year.
I hope you will take advantage of these suggested websites. I have used each of them, in one way or another, throughout the years in my quest to better identify and understand our fine feathered friends.