November 1936 – vol. 30, issue 6–179 THE Mute Swan (Cygnus olor) is a monogamous species, and menage a trois appears to be of uncommon occurrence. The term--menage a trois--was borrowed by F. B. Kirkman from human affairs and applied to the association of three individuals of a bird-species for the purpose of nesting. As a label, menage a trois is preferred to its synonym, bigamy, because menage a trois implies the setting-up of an ... This article is only available to registered users.To read more, please log in or purchase a subscription.