Caspian Tern, Hydroprogne caspiaCaspian Tern, Hydroprogne caspia (Penguin Island, WA)Caspian Tern, Hydroprogne caspiaCaspian Tern, Hydroprogne caspiaCaspian Tern, Hydroprogne caspiaCaspian Tern, Hydroprogne caspia (Rottnest Island, Perth, WA)Caspian Tern, Hydroprogne caspia (Rottnest Island, Perth, WA)Caspian, Crested and Fairt Terns (Rottnest Island, WA)Fairy, Caspian & Crested Terns (Rottnest Island, Perth, WA)Fairy, Roseate, Caspian & Crested Terns (Rottnest Island, Perth, WA)