Why on Earth are there Parrots living in the wild in Amsterdam?

Travelling from my hotel to TechEd I've been walking through Vondelpark - a place festooned with more high speed hazards(otherwise known as Bicycles!) than I've ever seen before! In the trees there were many Green Parrots which were sqwarking everywhere I went.

I spoke to some local people who informed me that over the years many people have let their domestic Parrots go in the park - they have bred - leading to a large population in the wild.

Very bizarre.