The wide river

A small character in a red hat and yellow pants stands in a dark, stone-walled chamber, then runs across a stone floor. The scene cuts to a group of dark, rodent-like creatures running up a staircase. The character is then seen running across the back of a large, grey goose swimming in water, with a dark, long-necked creature emerging from the water nearby. The sequence ends with a wide shot of the dark creatures swimming across a body of water under a pink and black sky.