I went internet fishing today and caught this quote, yanked it straight from the soggy depths. I bring it to you:

My “automatic vision systems” teacher gave an interesting lecture about research on hens. Hens are awfully dumb. They have an instinctive reaction to images of weasels (panic/run) and also to sound (tweeting) of small chickens (herd/care). The researchers made a model of a weasel that was making the chicken noise. Hens exposed to this experienced software failure: they would freeze and stop reacting to all other external signals/impulses until the chirping weasel was removed.

[ comment by SharpFang on the article Magpies are Self-Aware ]

You have no idea how badly I want to test this theory.