Crows tell the world who's bad

"If you've ever wondered what crows are saying when they caw at a perceived threat from the treetops, here is a sample: "I'm telling on you!" By watching who their neighbours and parents scold, one group of crows has learned to recognise and scold a dubious human."

http://www.newscientist.com/article/dn20624-crows-tell-the-world-whos-bad.html