Gyrfalcons may move seasonally, but are not considered migratory. We are not aware of a Gyrfalcon banded in Greenland and recovered off the island. We identified three Gyrfalcon eyries with young within 100 km of Thule Air Base and found three other locations where adults were seen but no eyrie or young located. We identified other sites at a greater distance north and south of Thule that may be occupied by Gyrfalcons some years or where young had already dispersed. All Gyrfalcons seen in the Thule District have been in the white color phase.
Dovekies appear to be the primary prey.
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