This bird was introduced in New Zealand in the 1860s where he started to hunt native birds. It is now considered an invasive species and treated as a pest. It has also been introduced in the Solomon Islands and Fiji, where he has not become invasive. Spring is the season when Australians Magpies cause problems between humans and throughout the Australia, when a small minority of breeding birds (almost always male) become aggressive and dive to attack any person (usually cyclists) passing near their nest .

http://en.wikipedia.org/wiki/Australian_Magpie