Theories about how these birds ended up in Brooklyn's Greenwood Cemetery:
- The Great Escape of 1967: a shipment from Argentina arrived at JFK and some unauthorized pilfering mistakenly released hundreds of monk parrots.
- A pet store on Flatbush Avenue went out of business and released them.
- A truck overturned on a highway.
- The Brooklyn Botanical Gardens, after many years of hosting a captive flock of monk parakeets, abandoned these birds to the skies after closing its aviary.