"Pasadena has a population of naturalized parrots. The city's website identifies one, a Red-crowned amazon parrot, but according to the Parrot Project of Los Angeles, the parrots fall into as many as five different groups. There is a cycle of regular public outcry about the noise and the sheer oddity of the birds' presence, but most Pasadenans seem to have come to accept the birds as part of the city's life. They can be seen year-round, but are especially noticeable in the winter. The birds are definitely gregarious, and the amount of disturbance their chatter creates is definitely related to the time of day they may choose to chatter.

Theories and myths abound on how these parrots came to claim Pasadena and surrounding towns as their home. A heavily accepted story by longtime residents of the area is that they were part of the stock at Simpson's Nursery on East Colorado Blvd. in the Lamanda Park area. The nursery was burned down in 1959, and the parrots were thereby released to forage in the lush Pasadena area. It is also possible that some parrots moved northward from their normal range in central and northern Mexico as human habitation in the Pasadena area created artificial habitat in which the parrots could survive. Among their favorite foods are the berry kernels of the cedar trees that grow in great abundance around Pasadena."

(http://en.wikipedia.org/wiki/Pasadena,_California)