Stock Photo: Eastern grey kangaroo Macropus giganteus, it is the second largest living marsupial and one of the icons of Australia Portrait of a dominant bull The Eastern grey kangaroo is mainly nocturnal and crepuscular, it is a grazer of mainly australian grassses a. Eastern grey kangaroo Macropus giganteus, it is the second largest living marsupial and one of the icons of Australia Portrait of a dominant bull The Eastern grey kangaroo is mainly nocturnal and crepuscular, it is a grazer of mainly australia