Recently mounted Gyrfalcon. This Gyrfalcon is set up very professionally and is placed on an original block. Of course, this Gyrfalcon has a fixed foot ring and comes with the correct cites documents. The Gyrfalcon (/ˈdʒɜːrfɔːlkən/ or /ˈdʒɜːrfælkən/) (Falco rusticolus), is the largest of the falcon species and is highly regarded by falconers.