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|Dusky x Naumann's Thrush (hybrid) (Turdus eunomus x naumanni) Thrushes and Allies (Turdidae)|
|Brundrossel x Rustdrossel (hybrid) Zorzal Eunomo x Naumann (híbrido)|
2020-11-07 Sorthat (north of Rønne), Bornholm, Denmark
First reported as a pure Dusky Thrush, but the photos reveal a substantial amount of rufous on the flank eliminating this possibility.
A young (darkish bill) female type with overall dull plumage.
The two species were split not so many years ago, and there is a large overlap zone where hybridization occurs. North east Asian species.
The bird was discovered a week ago, resulting in a similar slow twitch, as it happened with the Rufous-tailed Rock Thrush earlier this year. And as it happened then, this thrush was gone the next morning...
Surprisingly the bird has now been accepted as a pure Dusky Thrush by the Danish Rarity Commitee, SU. After consulting various expert on the subject they've put together an explanation as to why they reach this conclusion. See Netfugl.
I still haven't had time to dig into the matter myself, but will when I get access to my books.
Apparently young female dusky can show the amount of rufous feathers on the flank and tail base, as this bird does, and the pure dark and white markings in the head are argued to be a proof of a pure bird; hybrids always showing some orangy coloration here.
For now I'll let the bird be as a hybrid, and update later with my own thoughts on the subject.