Wild parrots in Burbank

As if Burbank wasn't already distinguished enough: I just learned that the town is also the residence of a big flock of wild parrots.  I saw them myself yesterday.  I'm told that these pretty birds squawk their way across Magnolia Park early in the am and about 5-ish in the evening.  Going where? Who knows.  Being chased by a huge wild airborne kitty, perhaps? Dunno. Going to work/coming home from the studios? Unlikely -- they wouldn't get off until 6.  Roosting after feasting on crumbs at Porto's? Maybe.  If you know anything about these parrots, I'd love to know who/what/when/where/why.