This an article mostly about quakers in USA -actually and more specifically, in NYC- and IRNs in London but it's interesting even if it's not really completely accurate because the reason why these particular species did well in these two locations is that the weather in London is actually quite mild and quakers are the ultimate survivor parrot not only because of their intelligence but also because of their social structure AND the fact that they are the ONLY parrot species to use communal nests all year round.
https://interestingengineering.com/how- ... astructure