witnessing a Sad loss

 Whilst walking my dog the other morning, I saw a dead rook by the path bordering a  field and thought I'd move it before a dog or child found it. I put it in the middle of the field and as I was walking back to the path I heard a raucous cawing. Looking up, a flock of rooks was wheeling round in the air above the unfortunate corpse. Never having seen this behaviour before, it reminded me of elephants who come to investigate the death of one of their own kind. I know corvids are highly intelligent as are elephants. Has anyone else witnessed this type of behaviour in birds?