The Saker is a large falcon, almost as large as the Gyrfalcon (Falco rusticolus), with an exceptionally broad wingspan for its size. Great variation in color and pattern can be found from a fairly uniform chocolate brown, to a pale sandy color with brown bars/streaks, to almost pure white. In general, however, they have a brown upperbelly and contrasting greyish flight feathers. The head and underparts are paler brown, with streaking from the breast down. Young birds tend to be a duller brown.