SummaryA number of the distinctive structural and behavioural features of the Magpie Goose,Anseranas semipalmata(Latham), can be more easily understood as adaptations to a particular way of life than as characters of great phylogenetic significance. It is suggested that a re-examination of other distinctive features of the goose may show them all to be part of a single. complex adaptation; that is to be the consequence of becoming a resident bird in a tropical swamp. It is pointed out that in many respectsAnseranasis very similar to the true geese, Anserini.