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Wow!
Couldn't this be a hybrid Black Redstart x Common Redstart? However, all other pics of (sometimes presumed) hybrids of these species that I found on the web show a rather abrupt transition between the black (upper) breast and reddish belly. Furthermore, the black/greyish colours of this bird's breast extend further down to the lower part of the breast and the flanks.
Do you (or does anyone) have a better explanation for the reddish belly and vent?

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