There are eight types of thrashers in North America. The Brown Thrasher is the most common and can be found in most southern areas of Canada except for British Columbia. They are also found in the central portions and eastern regions of the United States as well as throughout Mexico. The Sage Thrasher is the only other thrasher that may be seen in the southern regions of Alberta and British Columbia. The remainder including the Bendire's Thrasher, California Thrasher, Crissal Thrasher, Curve-billed Thrasher, LeConte's Thrasher and Long-billed Thrasher live in the southern states and into Mexico itself.
Most often thrashers feed on the ground. Six of the species have glaring yellow eyes but the California Thrasher and the LeConte's Thrasher have dark-coloured eyes. These shy long-tailed and long-billed birds are quite hardy and survive among the undergrowths in a hot dry climate but can occasionally be enticed into an opening around birdfeeders.
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.