The coloration of their plumage as for their bills changes when they are juveniles, adults breeding and non-breeding plus the reflection of the sky or sun. You can see them black, gray, blue, green, brownish. Their bill are black non-breeding and yellowish when breeding. Soon I’ll post some pictures of E. Starling showing a difference. Thanks Susan! 🙂
H.J. Ruiz - Avian101 
Are your European Starlings more brightly coloured than ours? They do seem to be.
The coloration of their plumage as for their bills changes when they are juveniles, adults breeding and non-breeding plus the reflection of the sky or sun. You can see them black, gray, blue, green, brownish. Their bill are black non-breeding and yellowish when breeding. Soon I’ll post some pictures of E. Starling showing a difference. Thanks Susan! 🙂