Hummingbirds are only found in North and South America. South America has over half of the known species of hummingbirds found there. Ecuador is known to be the country with the greatest number of hummingbird species with a total of 163 different species. There are over 50 different species of hummingbirds that are known to breed in Mexico. Of the 16 differnt species of hummingbirds that breed in the United States, only the Ruby-throated Hummingbird beeds east of the Mississippi River. Only four species of hummingbirds breed in Canada.