Some of New Zealand's native bird species just aren't meant to live in an urban environment.
New research by Victoria University suggests Pukeko, Kaka and gulls are most likely to cause problems in New Zealand's cities in the future.
It compared native birds in cities all over the world and found birds that eat a large range of foods are most likely to cause strife in urban areas.
Master of Science graduate Kerry Charles says, ironically, the success of nature restoration projects in urban areas may raise the chances of conflict as more birds flock to the cities.
She says Kaka are already starting to cause problems with reports they are damaging properties.