I own and Admin www.kakariki.net
If you want to know about my expertise in red and yellow kakariki, kings Crimsons and other exoric species there are forums, alums and galleries
Chances are they where escapees from a breeder that used to live near by, sadly now past on.I had seen a wild red-fronted parakeet in mid 1980s at Kelston school when I were a boy.
If you are really interested..want to have a look at our setup..which is now far more extensive than in my album at kakariki.net..you are welcome, a chat over coffee while feeding 2 pair of breeding pair of kakariki a bit of mint they use for 'insectide and pruning, sitting on eggs and young flapping around
Email me thru this site or web master at kakariki.net...top left of the page.
This thread pretty well covers the subject of ring necks..proven to be an issue in many other countries as well
http://www.birdingnz.net/forum/viewtopi ... lit=parrot