These tropical birds are being identified by different individual last names. The ABA (American Birding Society) identifies them as parrots. While eBird, created by Cornell University identifies them as amazons. Some introduced parrot spieces are now nesting in North America. They are becoming a more common bird species seen in southern California, south-eastern Texas and southern Florida, areas of the continent, where the temperatures are warm. Today, the Red-crowned Parrot, the Lilac-crowned Parrot and the White-fronted Parrot populations are considered to be at a point where these birds are now self-sustaining in the wild. This being the case, these three parrot species are now considerd nesting birds found in North America. The Thick-billed Parrot is a native bird of Mexico, and at least one time, it has been seen in the US. It is a recognized as a vagrant. There are other parrot species being seen, all introduced at some time or another in the past. These other parrot spieces may all become recognized nesting parrots in North America in the future.
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.