Corvids etc

Thanks Bob & Annie. BWP says "Although juveniles most often join adult flocks, they sometimes predominate or even form independent flocks, often with Jackdaw." This latter is what we get on the Nevern Est. It still begs the question of where are the adults. And can anyone give me any sure fire way of seperating juv Rooks & Carrion Crows. I know about curved or straight culmens, pointy heads, loose plumage & calling in 1s or 3s but haven't found any or all of them particularly helpful. Some years ago, when I was new to Med Gulls, I was advised to start with the bill (vs BHG), & it's true. Something similar for Rook vs CC would be much appreciated.

The 2nd cy Med Gull at Newport is Red PEK4-presumably from Poland or Hungary. I hadn't noticed the red ring on the red leg yesterday.Also a flock of 12 Redshanks & a Kingfisher this am.