In 1974, fewer than 50 collared doves escaped in the Bahamas. The species now occurs in nearly every US state and in Mexico.

Pigeons, Doves and Sparrows · day 4 of 7
Fewer than 50 doves escaped in 1974.
It spread about 100 km a year in Arkansas.
Flocks of up to 10,000 have been sighted.
Six broods in one year is the record; three or four is more usual.
The male climbs almost straight up, then glides down in a circle.
More about the Eurasian Collared-Dove
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