Do some Gyrfalcons nest in trees?

Gyrfalcons, while primarily known for their preference for nesting on cliffs and other elevated locations, do indeed exhibit behavior where they can nest in trees as well. This flexibility in nesting habits is influenced by the availability of suitable sites in their environment. In regions where cliffs are scarce, Gyrfalcons have been observed making use of tree cavities or platforms for nesting.

The ability to adapt their nesting behavior to utilize trees indicates their resourcefulness in various habitats. Thus, confirming that Gyrfalcons can nest in trees acknowledges the species' adaptability to different geographical conditions and the nesting materials available to them.