In Australia, two main migratory populations have been identified, off the west and east coasts, respectively.

In migratory populations, egg-laying usually begins between early April and late May.

They have resorted to several means of snatching the land or extracting money from the migratory population.

Owls in migratory northern populations are less likely to return to the same burrow every year.

This mating pattern has led to the development of the separate migratory population.

A few species have both migratory and sedentary populations.

They may remain in their parents' care until the following breeding season, though in migratory populations, the young and adults often separate.

The migratory populations have been observed to be nearly entirely consisting of males.

The most numerous are those in the large migratory populations that occur from Alaska throughout much of northern Canada.

Other reports, also published between 1995 and 2007 find that there was gene flow from many migratory populations.