Mascarenachen kervazoi is known only from subfossil bones collected by Bertrand Kervazo in the Grottes des Premiers Français on Réunion (to France) in 1974². Nontekoe mentioned finding geese on the island when he visited in 1619, as did Dubois in 1671-2, but it was not to persist long and the species was specifically mentioned to have become extinct by Boucher in 1710¹. The specimens are deposited in the Muséum National d'Histoire Naturelle, Paris².