Blackbird?

Hmmm.
I saw this unusual bird on my fence this afternoon.  I took a photo of it at a great distance and wasn't until I got it up on the computer screen that I realised it is a blackbird.  A weird one for sure, but still a blackbird.  

I don't actually know if this is 'normal' for young blackbirds or if this is some sort of mutant.  I've certainly never noticed one like it before. 

Not a good capture, but interesting enough to be my blip anyway (and I didn't take anything else today other than another monarch).