gyrfalcon.

/jur-fawl-kuhn, -fal-, -faw-kuhn/US // ˈdʒɜrˌfɔl kən, -ˌfæl-, -ˌfɔ kən //UK // (ˈdʒɜːˌfɔːlkən, -ˌfɔːkən) //

海尔法尔康,海尔法康,海尔法尔肯,海尔法尔克

Definitions

1.
- ›a large falcon, Falco rusticolus, of Arctic and subarctic regions, having white, gray, or blackish color phases: now greatly reduced in number.

The gyrfalcon can certainly not catch a phalarope in flight.
The Gyrfalcon is the best-proportioned and most active member of the Falcon tribe.
This bird is as large as the Gyrfalcon, but, although equal in cunning and address, is possessed of less courage.
A dead Arctic tern was on the beach only 90 feet away and visible to the gyrfalcon.
Westley Redhead told us that a gyrfalcon was at Umiat as early as the latter part of May, 1952.