I patted a penguin on the head once - and nearly got thrown out of the Mystic Aquarium in CT. They have the penguins in open-topped enclosures - kinda of like a hamster habitrail for penguins - a swim course you walk along. This little guy popped his head out of the water and "gave me the eye" - so of course I gave him/her a little pat on the pate - and was busted immediately by an irate guard. We didn't have time for smooches - so I can't speak to their breath quality.
