Not only crows, but bears, too
[Scare-bear robot will haunt your dreams] (Viewer #1,737,069)
They don’t say where he got the idea for it, but I’m betting that somewhere along the line, someone told him “Mustafa, your scarecrow’s pathetic…”
[Vault Scarecrow – Full Length] (Viewer #48,785)
(Full disclosure: Best TV commercial ever made)

I’m afraid this poor scarecrow has a rather bad ending….. http://www.youtube.com/watch?v=wSa7ZGzaorQ
wow…that was pretty scary…and it makes a pretty awful noise too.
…and that shaky thing with the beard and yellow coat was pretty scary too.