This bird was photograped in Aarhus on March 4, 2010. It has a completely black head, due to a genetic mutation causing melanism - the laying down of extra pigment in the feathers. Other such individuals have been recorded elsewhere like this
‘black-headed’ Great Tits in UK and this
‘black-headed’ Great Tits in Denmark.
See also this
‘black-headed’ Blue Tit in Denmark.
![](http://3.bp.blogspot.com/_wpfoS655UiU/S5JAi4mTUxI/AAAAAAAADUw/9c65AyBDTXs/s400/_MG_4014.JPG)
![](http://4.bp.blogspot.com/_wpfoS655UiU/S5JAj6rYSjI/AAAAAAAADVI/_5HmQsm6XVs/s400/_MG_4018.JPG)
![](http://2.bp.blogspot.com/_wpfoS655UiU/S5JAjjxrgbI/AAAAAAAADVA/HL1QjFj75ws/s400/_MG_4025.JPG)
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