No need to push, just form an orderly queue

Penguins often walk places in groups in single file. Often this is because they are walking through snow and for each individual to break the trail would use too much energy, so a line ensues. Quite why this lot are still standing like this while clearly going no-where is anybody's guess.

This picture by Jérôme Maison. © 2005 Bonne Pioche Productions / Alliance De Production Cinématographique.
From the Warner Brothers film The March of the Penguins used here by permission of Warner Brothers.