Bei flüchtiger Betrachtung, u. a. bei abfliegenden Vögeln, kann durch die helle Verfärbung der Eindruck einer Ringdrossel entstehen.
Here are three images of a Eurasian Blackbird (Turdus merula) covered in hoar frost. A very fleeting glimpse at such a bird flying off might remind the observer of a Ring Ouzel (Turdus torquatus) and seems like a possible explanation for out-of-season winter observations. [There was a discussion about a December Ring Ouzel from NE Germany on one of the listservs I am a member of, and this is the reason behind posting these images here and now.]
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