Ferry Park, San Francisco, CA
Well, this was not a sign I expected to see in the middle of the city. But it is true - there is a flock of wild parrots that make their home in San Francisco. Actually, there are TWO flocks of birds in the city, but this park is often home to the famous "Wild Parrots of Telegraph Hill." (The scientific name is Aratinga erythrogenys, also known as a cherry-headed conure, among other names.) This species comes from the west side of the Andes in southern Ecuador and the extreme north of Peru.
Resident Mark Bittner maintains a website promoting his book, his film, and general information on these birds. He also was integral in creating this law in 2007, banning the feeding of the birds.
From Bittner's site, I also learned that there is a wild parrot flock in Chicago, Illinois! (First spotted in 1973 in the Hyde Park neighborhood.)