Sidney the African Penguin (see the name on the band around the wing). Surprisngly, he was a little lazy and didn't make his tankmates any better. They actually seemed to resent him during feeding time when he suddenly got a burst of energy and went to the front of the line. Very selfish. What an asshole.
The exhibit was designed to put the penguins in an environment that did not impede them from their natural habits. Here's one diving.
The National Aviary officials observed this happening but didn't do anything to discipline the penguins.