Kurt Vonneduck’s Timequack is the story of Ludwig von Drake, an inventor who builds a time machine that transports him to a Duckburg of the Far Future (802,701 anno mallardi), an almost unrecognizable world in which ducks have divided into two separate species.
As Von Drake explores this strange Future Duckburg, he sees that the Muscoveloi live pleasant lives on the surface of the duckpond, their needs provided by the underwater-dwelling Mallardlocks. It is only after days of observation
and speculation (interspersed with several harrowing adventures) that he realizes that, to the Mallardlocks, the Muscoveloi are naught but farm animals!
[Inspired by a typo. The book, of course, is Timequake.]