Bizarrely, the collective noun for a group of Carrion Crows is a "Murder of Crows".
I don't think the Crows killed the Wood Pigeon. I think they are just carrying out their job as Carrion Crows.
(But they may have killed it - they do atack young and injured birds.)
They like a bath or shower (the sprinkler shower includes a Jackdaw).
They will raid garden bird feeders.
"Is it edible?"
"For a Cuckoo that size we need reinforcements."
This one has brownish plumage.