Penguins!

In anticipation of the arrival of the zoo commissioner, a security detail quickly examines the zoo and its animals for threats. But as they leave, Skipper believes that the agents have done an inadequate job, so he and the other penguins take it upon themselves to ensure the zoo is safe for the commissioner's arrival to cut the ribbon on a new children's zoo. In doing so, they soon uncover that a pigeon, Frankie, has plotted to "drop one" on the commissioner's suit in retaliation for his implementation of anti-pigeon park regulations. Skipper then tells the other penguins about how he had failed to act under similar circumstances when the previous commissioner had been attacked with bird droppings containing blueberries, vowing to not let the same happen again. The penguins then chase after Frankie, with Skipper flying through the air using a jet-pack, but the pigeon soon ends up releasing his blueberry-infused vendetta. Skipper dives in and takes the hit for the commissioner, and his team is horrified at the resulting look of their leader. Fortunately, however, Skipper reveals that he was wearing a "pigeon-proof vest" as he pulls it off his body. The vest is soon launched at Frankie via a makeshift cannon, resulting in the pigeon suffering the same fate he had intended for the commissioner.