According to the California Parrot Project six species of Amazons have naturalized here: Red-crowned, Lilac crowned, Blue-fronted, Red-lored, White-fronted, Yellow-headed. There are many theories as to how they came here. When I was in Borrego Springs I saw them living in the palm trees. I was told they had migrated there from Mexico.
I found mention of a grey paorrot naturalization on another site, but could not verify this.
There are verified flocks of parakeets, cockatoos, macaws, lovrbirds, budgies, cockatiels, etc.
I thought some of you in other parts of the world might be interested in knowing we have wild parrots here.
One of the flocks in Redlands came just before sunset while my husband was dying and called to him, "Come fly with us." He answered, "Silly birds, I can't fly." They laughed as they flew off. He did join them a few hours later.