Why is the gyrfalcon considered the world’s largest falcon?

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The gyrfalcon (Falco rusticolus) is considered the world’s largest falcon due to its significant physical dimensions compared to other species in the family Falconidae.12

This Arctic bird of prey can reach a length of up to 60 cm (2 feet). Furthermore, there is a notable size difference between the sexes, a common trait among falconiforms; females are particularly large, weighing between 1,400 and 2,100 grams (3.1–4.6 pounds), which is nearly twice the weight of the males.13