Bicknell’s thrush

Description

Bicknell's thrush is just slightly smaller than the other northern migratory Catharus thrushes,with an average length of approximately 17 cm (6.7 in) and a mean weight of 27.8 g (0.98 oz),with a range from 21 to 36.8 g (0.74 to 1.30 oz).The sexes are roughly the same size,although males average slightly larger in wing length.Adults are olive-brown on the upperparts,slightly redder on the tail.The underparts are white with gray on the flanks;the breast is greyish brown with dark spots.They have pink legs,a faint grey eye ring,and gray cheeks.They average slightly smaller than the very similar gray-cheeked thrush but are all but indistinguishable in outward appearance.Together,gray-cheeked and Bicknell's thrush form a cryptic species pair,and were indeed formerly considered conspecific.The song is a jumbled series of flute-like tones ending on a higher note