Honestly, with a parrot, especially a grey, I tend to discourage adopting an older bird unless you are an experienced bird owner. There is a lot to be said with getting a parrot young. Yes they are captive bred and raised now, but they are not like dogs. They are a lot more wild than tame if you get one as an adult that hasn't been properly raised and cared for. Parrots tend to bond to one person in the household, and greys are notorious for this. This will not be a family pet like a dog as a rule of thumb. As young birds, they can be pretty social, but as they get older they tend to pick their "person." Also, many parrots can learn very bad habits such as plucking and screaming which are VERY difficult to break once started. If raised properly, this typically won't be an issue, so again, I usually refer most people to look for a breeder or local bird store that specializes in parrots (as opposed to say, a chain petstore like petsmart or petco which don't even sell big birds anymore around here).
I've had a lot of parrots over the years and adopted a few off CL to foster and rehome to an appropriate home, including macaws. I have one keeper parrot - a blue fronted amazon that is a great example of a properly raised parrot, especially an amazon. He's friendly, never bites me, doesn't scream but talks and chatters quite a bit, whistles songs, is not terribly destructive (in parrot terms).
They need a lot of space, a good diet (not seeds - pellets and fresh fruit/veggies are best), lots of interaction, and patience.
Parrots are GREAT if you are prepared. Greys do not tend to be screamers (though they do mimic a LOT and it can get very repetitive and annoying hearing your microwave beep hundreds of times a day, etc), but can be quirky.
Last edited by Rerun; 12-27-2012 at 12:52 PM.