Cockatoo Only Attacks People When Her Owner Isn't Around (VIDEO)

Uh-oh. Looks like we're going to have to increase our '11 Animals That Can Kick Your Ass' slideshow - see below - to 12.

The 12th animal being Boo the cockatoo in the video above.

"Boo, who ate part of my brother's ear, has not rid the taste from her system," writes YouTube nowledge. And to prove it, he's set up a little trap to catch Boo, who has a taste for attacking people - but only when her owner (nowledge's mother) isn't around to see it. The cunning old bird!

Click play to watch the drama unfold. And be warned: it's pretty scary stuff. Now we know what Alfred Hitchcock was getting at with 'The Birds'...