Penguins parade around the hallways of the National Aviary as part of a celebration Tuesday of World Penguin Day at the National Aviary on the North Side. The day kicks off a week of events focused on "all things penguins" designed to help visitors learn more about the animals and includes an opportunity to name one of the Aviary's newest penguins through May 20. (Photos by Pam Panchak/Post-Gazette) #Pittsburgh #PGH #412 #Penguins #WorldPenguinDay #NationalAviary #PGPhotos