The iVillage team made a fascinating discovery this week: penguins giggle when tickled. Really.
Watch this video of Cookie (cutest name ever, no?), a little penguin at the Cincinnati Zoo, cackling away as he's tickled under the wing. His joyful outbursts sound like a puppy, a cat and a squealing 4-year-old all rolled into one. Adorable.
The tickling commences around the one minute mark.