A feral parrot is a parrot that has adapted to life in an ecosystem to which it is not native. Many are descended from pets that have escaped or been deliberately released. Feral parrots may affect native biodiversity, human economy and wellness.
Feral colonies of rainbow lorikeets (Trichoglossus haematodus) have been established in Perth, Western Australia and in Auckland, New Zealand.
The eastern rosella (Platycercus eximius) has become naturalized in the North Island of New Zealand.
A sizeable population of naturalized rose-ringed parakeets (Psittacula krameri) exists in and around cities in England, the Netherlands, Belgium Rome, Lisbon and western and southern Germany. The largest UK roost of these is thought to be in Esher, Surrey, numbering several thousand. Feral rose-ringed parakeets also occur in the United States, South Africa, Egypt (resident, breeding all over Giza territory in June), Israel (with many seasonally present in Yarkon Park in North Tel Aviv), Lebanon, UAE and Oman. There are also several populations in Istanbul, Turkey, both on the European side where they can be seen in Gülhane Park, Yıldız Park and Eyüp, and on the Anatolian side.
Also found in the United States are various naturalized Brotogeris species (mainly B. versicolurus (canary-winged parakeet a.k.a. white-winged parrot) and/or B. chiriri (yellow-chevroned parakeet/parrot).