Optical illusion asking 'How many horses can you find in this picture?' goes viral

An optical illusion titled 'How many horses can you find in this picture?' has gone viral. Puzzle experts at Kids Environment Kids Health said there are supposed to be seven horses, including a horse head and rear. "But if you still don't see more than...five or six horses...you're among the many who believe...the real number...should be five," a note read.