Donald Duck & Co #47/1974

In "Lemen-jakten," Uncle Scrooge’s new safe holds a secret—its combination hidden in a locket that ends up around the neck of a lemming during a chaotic moment in his office. When the tiny creature escapes onto a passing schooner, Donald Duck and his nephews Ole, Dole, and Doffen follow the ship all the way to Norway, where they’re stunned to find themselves in the midst of a vast, mysterious march of lemmings toward the sea.