 In addition, three introduced mammals were previously established in the Houtman Abrolhos, but have since been eradicated.The black rat ("Rattus rattus") was established on Pigeon and Rat Islands, but has been eradicated by poisoning.The European rabbit ("Oryctolagus cuniculus") has been introduced at various times onto Leo Island, Middle Island, Morley Island, Pelsaert Island and Wooded Island.