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The actual tones of the bird look good to me.
Not very keen on the pure white background, as any context is lost, and that is usually quite important for wildlife.
And, for me, other factors such as strong shapes or composition don't compensate in this case.
I think they can work but context is needed as what @Elines said.
In this instance it doesn't work, think you need specific birds and specific lighting conditions to achieve it.
This is a bird I like, cheeky little chaps I think.
I prefer the colour version Les and agree that the plain white BG does nothing here.
And no I don`t think the mono shot has worked here.
I'm going to buck the trend here and say that I think it works well, even the plain white background. I love the tones and detail in the bird and the background sets it apart. I agree that context is important but sometimes, even bird shots, can be a little more abstract.
I agree with Steve, especially as the starling's strong markings lend itself to a conversion ... some can be more 'striking' like this and some more subtle e.g high key
I like both but lean towards the black and white. It would make a brilliant novel cover is the fist thing I thought