 The IBA regularly supports over 20,000 waterbirds, including 4000 to 15,000 waders and over 10,000 nesting seabirds.The largest Victorian colonies of white-faced storm petrels comprise some 12,400 nesting burrows on Mud Islands and South Channel Island.Mud Islands also has important breeding colonies of Australian pelicans, silver gulls, greater crested and Caspian terns, and ibises.