East Siberian Merlin

Adult males are pale-greyish on upperparts, with whitish forehead; central tail feathers usually only with one terminal dark band; underparts are whitish or rufous with very narrow streaks; whitish bar-pattern on the inner webs of primaries is well developed and often formed the solid space at shaft of feather. Females and juveniles have clay-tinged and more pale background brownish upperpats and pattern on underparts than in aesalon; on mantle they have rufous-brownish pale cross-pattern; the pale bands on tail-feathers are broad and ordered. Larger than aesalon: wing of males 190-208, females 213-232 mm. Length males 285-313, females 325-334 mm. Wingspan males 589-600, females 623-625 mm.