Confused Fledgling

Got home from work this evening, opened the back door to go attack the dandelions and this was sitting less than two feet in front of me:

Its parents were sitting on the fence looking anxiously at me so I retreated back in doors, (this pic was taken a little while later from the kitchen window to minimise disturbance.)

It was a bit of a shock to me as I didn't know we had a nest this year, Judging by his colour it looks like the poor little fella got more of a shock than me though!! 

Both mum and dad are regularly bringing in the worms, so I'm assuming he's ok and should be left alone? ( http://www.rspb.org.uk/advice/helpingbirds/health/babybirds.asp )  and that I'll just have to leave the dandelions alone for a few days. dagnamit!  just hope that the neighbourhood cats keep their distance.

 

I have never seen a white blackbird before, how common are they?

 

P.