Native birds have always been in their current location. Introduced birds have been brought in from elsewhere - either deliberately or accidentally.
They decrease the already threatened population numbers of ground based and flightless native birds.
there are birds on Guam, but most of the native birds were killed by the brown tree snake that the US accidentally introduced. The snakes stowed away in ships' cargo brought in from other parts of the Pacific (like the Solomon islands) where the snakes are native.
Black necked storks are native to Australia and are a threatened species.
Two i can think of the Tui and the Morepork (Ruru). The Kereru (Wood pigeon) is also not threatened.
Pheasants are large, long-tailed gallinaceous birds that are native to the Old World but were introduced elsewhere.
who introduced squanto to the native Americans
Introduced birds are birds from other countries i.e. some believe the magpie was brought from Australia into New Zealand
Foxes are introduced to Australia - there is no species native to the country. And, unfortunately, nothing eats them except for birds of prey.
Native!
Birds can fly away if threatened by raccoons.
Starlings are birds that are native to Europe. They were intentionally introduced into the United States. They were first introduced in New York but have spread across the country.