The literature pointing out that ethnic groups are a social construction has a particular salience in discussion of identity in both East and Central Africa. As numerous authors have noted, there are in fact few linguistic, phenotypical, or social differences between Hutu and Tutsi. Indeed, as all acknowledge, there has been substantial intermarriage, particularly in Rwanda. Nevertheless, as recent events in Rwanda and Burundi illustrate, the presumably ‘socially constructed’ differences between Hutu and Tutsi have become a legitimated reason for murdering one's neighbours. But although cited as the cause of the civil war by virtually every Rwandan, as well as the Western and Tanzanian press, I am also impressed by the fact that at different times and places being ‘Tutsi’ means very different things. My own observations in the Benaco refugee camp for ‘Hutu’ illustrate how quickly and drastically such seemingly ‘fixed’ identities can change.