Thanks for your replies...hope there are more out there doing something on this topic too and will share. The places we are looking at require confirmation of donation in a trust or will to ensure a place. The $ amount is quite high, but in actuality it is a donation that helps the place to carry on and we'll be leaving most of what we have to charities anyway. If we had close family or friends we think that would be our first choice, but we have been told by a number of people that often people's intent to carry out your wishes regarding pets are genuine, when the time comes they take the pets to the humane society or animal control perhaps because of circumstances. Since the sanctuaries require at least a 10 hr car trip from our residence..we've got to find out how that should be done and specify. Two of ours take daily meds...one is fairly expensive (has asthma). But with any luck we will outlive them all!!
BTW, I'm sure Best Friends takes parrots....give them a look. Thanks again!