A recent  article in The New York Times is about Monk Parakeets in New York, not Ridgefield, but a lot of useful information…

Here’s a sample:

They are natives of central and southern Argentina, where steamy summers are common and snowy winters have prepared them well for life in the five boroughs.

In New York City, the monk parrot has generated volumes of urban mythology. It is one of many animals reputed to have colonized the Northeast through broken shipping crates and other misadventures at Kennedy Airport, but its current presence in Belgium, Britain, Israel, Spain, Chicago, Cincinnati, Rhode Island, Wisconsin and of course New York City implies a less romantic explanation.

Monk parrots were popular pets in the 1970s, easily trained and cooperative. So a global pandemic of smashed shipping crates is less likely than occasional releases — intentional and not. Though there may have been occasional shipping mishaps, pet owners are probably at least as responsible for this parrot’s spread.

The link is here.