ケープペンギン
BirdLife International considers Mercury Island as an Important Bird Area (IBA). Indeed the four Namibian islands of Mercury, Ichaboe, Halifax and Possession are critical for the breeding of a number of rare or endangered species of birds including the Cape gannets "Morus capensis", the endangered African penguin "Spheniscus demersus", and the crowned cormorants "Microcarbo coronatus".