They help us analyze how the human brain perceives various stimuli ... But not all of them are toys. One of them is a real owl. Test your observation skills with this optical illusion IQ test.

Rockefeller "Rocky" the Saw-whet owl was released near Saugerties, New York, after receiving a clean bill of health from his rescuers, avian veterinarians, and owl researchers. Rockefeller is back ...