I didn ' t quite mean really positive , I meant more as a comparison to other nonnative ' invasive ' species . I ' ve often heard that quakers are banned because of their effects on agriculture which I doubt personally . They are still ' invasive ' to a point because they can breed quite well and I assume over longer time periods over the year vs other species due to their nest ' s ability to regulate temperature better . The nesting spot competition is something that I hear quite a bit about in regards to competition within my country , Australia . So I thought it interesting to see if you have any other views on it . If this research does go ahead , I ' d certainly be interested to see how their behaviour is different between the different climates . I live in an area that has many native parrots and the difference between colderwarm climates in general , then different countries within their native temperature ranges , is something that I also wonder about . Not that I would know how different they can be .