Sparrows were first introduced to New Zealand in the 1860's, but quickly came to be regarded as a pest. Also known as flying mice they are found all over New Zealand, except in high mountainous and bushy areas, and are one of the most abundant bird species in New Zealand.
Sparrows live close to humans as they are dependent upon them for food, as much of their diet is human food scraps. They also eat; grain, cereal, buds, nectar, fruit and seeds, and are fond of ripe fruit, in particular cherries, grapes and peaches. They are a bold, intelligent, gregarious bird, and would happily come right up close to people. They work together well, setting off a racuous that warns everyone if predators come near. It would be extremely rare to find sparrows away from habitation.
To all they are a pest. In the agricultural industry for damage to crops, but also in and around food outlets, nicking whatever little pieces of food they can find - even if its off your plate. Also they are very messy nesters, and can cause mess and health and safety issues in and around buildings.