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Naumann's Thrush has pale brown back and head.
There are suggestions that the songs of Dusky and Naumann's Thrush differ.
These are sometimes given specific status as 'Naumann's Thrush' and Dusky Thrush respectively.
It is closely related to the more southerly breeding Naumann's Thrush T. naumanni; the two have often been regarded as conspecific.
Naumann's Thrush, Turdus naumanni, is a member of the thrush family Turdidae which breeds eastwards from central Siberia.
This species breeds in open woodland areas, but unlike Naumann's Thrush, Dusky Thrush is more tolerant of mountainous and tundra-edge habitats.
The song of Naumann's Thrush may differ from the simple fluted or whistling Redwing-like song of Dusky Thrush.
Naumann's Thrush in comparison has a paler brown back and head; the face, breast, flank spots and rump are reddish, and the belly and undertail are white.
He wrote an important book on the birds of Germany entitled Naturgeschichte der Vögel Deutschlands (1804), and his name has been commemorated in the Latin names of the birds Lesser Kestrel, Falco naumanni, and the Naumann's Thrush, Turdus naumanni.
Dusky Thrush (Turdus naumanni)