by Alex A. Kecskes
Among the family of pest birds that plague our homes and businesses, one can include the bird type known as "invasive birds." Birds that fall into this category can pose a problem for wildlife, agriculture and, most alarmingly, human health. So what constitutes an invasive bird?For starters, invasive species are not native to a particular area. Without bird deterrents to control them, they will threaten the local ecosystem and economy, and pose significant human health risks. It should be noted that not every non-native bird can be classified as invasive. Many of these nomads readily adapt to new and different ecosystems without threatening these habitats. Only when a species significantly impacts a new area can it be labeled as invasive. It's also worth noting that a species that may be considered invasive in one area may be entirely innocuous in a different region.Birds that many consider invasive in North America include the European starling, house sparrow, mallard, mute swan, rock pigeon and Canada goose. These species and others who fall into the category of invasive are introduced to an "invaded area" a number of ways. One way is simply through geographic expansion, e.g., when one species crowds out another threatening the species or the ecosystem that supports it. Another way a species becomes invasive is when it is deliberately imported as in the case of early European settlers who brought over birds they liked from their native countries, or when farmers imported birds to control the threat of insects. Regardless of how they came to an area, unless they are controlled with bird deterrents, invasive birds can create all sorts of problems. They compete for nesting sites and food sources, they eat crops and seeds, they carry any of 60 known diseases, and they disrupt an area's ecological predator/prey balance.In many areas, invasive bird species are protected by wildlife conservation measures or migratory bird treaties. Before attempting any lethal means of control, property owners should contact their local wildlife management office. The other alternative is, of course, to use non-lethal bird deterrents. These are effective, humane, and run the gamut from simple to high tech. Let's look at a few.