Bernier and Dorre islands in the north-west corner of the heritage area are among the last-remaining habitats of two varieties of Australian mammals, hare-wallabies, threatened with extinction. They are used, with numerous other smaller islands throughout the marine park, to release threatened species that are being bred at Project Eden in François Peron National Park. These islands are free of feral non-native animals which might predate the threatened species, and so provide a safe haven of pristine environment on which to restore species that are threatened on the mainland.