This Pettigrew guy seems pretty serious about animal characteristics and what it means for humans !
As an aside, the top ten finalist illusions for the 2011 7th Annual "Illusions of the Year Contest"
is here. They're well worth a squizz !
They're all pretty neat, but the "Grouping by Contrast" one, which one second prize is simply awesome. (Mind you, the first one is a corker as well !)
Cheers