E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Bean Goose (The).
A migratory bird which appears in England in the autumn of the year, and is so named from a mark on its bill like a horsebean. It is next in size to the Grey Lag-goose. The term comes from the northern counties where the bean (goose) is common.
Espèce doie dont les mandibules sont taillées en forme de féveroles.Royal Dictionnaire.