Siberian stonechat – Saxicola maurus
is a recently validated species of the Old World flycatcher family (Muscicapidae). Like the other thrush-like flycatchers, it was often placed in the Turdidae in the past. It breeds in the East Palearctic including in easternmost Europe and winters in the Old World tropics.

It resembles its closest living relative the European stonechat (S. rubicola), but is typically darker above and paler below, with a white rump and whiter underparts with less orange on the breast. The male in breeding plumage has black upperparts and head (lacking the brownish tones of the European stonechat), a conspicuous white collar, scapular patch and rump, and a restricted area of orange on the throat.

The female has pale brown upperparts and head, white neck patches (not a full collar), and a pale, unstreaked pinkish-yellow rump. Males in winter plumage are intermediate between summer males and females, with a supercilium resembling the whinchat (S. rubetra); from this species and the female it can be distinguished by the full white collar.[1]

If seen at close distance, it can be recognized that its primary remiges are distinctly longer than in S. rubicola. In this, it closely resembles the whinchat, which like S. maurus is adapted to long-distance migrations.

The male has a clicking call, like two pebbles knocked together. The song is high and twittering like the dunnock (Prunella modularis), an unrelated passeridan songbird belonging to the Passeroidea.

It sounds like this
Recording by Amar-Singh HSS from Xeno canto