Los Angeles parrots - where did they come from and are they bad for the environment?

Conure - Wikipedia

A Guide to The Feral Parrots of the US

Former pet parrots breeding and thriving in 23 U.S. states

Why L.A. parrots are getting louder - Los Angeles Times

L.A. is home to a famous flocks of parrots. How'd they get there?

California's Parrots: Pleasure, or Problem?, Redefine

Macaw, Diet, Habitat, & Facts

Immigrating Parrots Find Asylum in L.A. – M'Online

The Parrot Should Be the New State Bird of California - Los Angeles Mystery

Parrot species are nonnative transplants in San Diego - The San Diego Union-Tribune

Wild parakeets, far from their native land, have taken a liking to London

The Wild Parrots of Southern California - Articles