Penguin's Fish Storage

Listen up, smarty pants! You know penguins, right? Those cute birds that waddle around? Well, this joke is saying they carry fish in their mouths because they ain't got no pockets! Get it? It's funny because everyone knows penguins don't wear clothes, especially not clothes with pockets. So where else are they gonna put their fish? Sheesh, some people need everything spelled out for them.