Did you know the answer? Maybe you live in a community where this species actually lives since they have been able to adapt to living in areas of the US.
A: Quaker parrots also known as Monk Parrakeets link their nests with other Quaker Parrot nests sometimes making groups of nests that can weigh up to 200lbs!
(Source- About.com Pet Birds)
This type of nest is unique for parrots but unfortunately, the nests and their ability to adapt to living in cold climates has made them illegal to own in some states for fear people will release them into the wild.