The saker falcon is a large hierofalcon, larger than the lanner falcon and almost as large as gyrfalcon at 47–55 cm (19–22 in) length with a wingspan of 105–129 cm (41–51 in). Its broad blunt wings give it a shadow similar to gyrfalcon, but its plumage is more similar to a lanner falcon’s.
Saker falcons have brown upperbellies and contrasting grey flight feathers. The head and underparts are paler brown, with streaking from the breast down. Males (called sakrets in falconry) and females are similar, as are young birds, although these tend to be a duller brown. The call is a sharp kiy-ee.
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