The common toadfish or common toado or toadfish or toado (Tetractenos hamiltoni, formerly classified as Tetrodon hamiltoni or Torquigener hamiltoni) is a species of fish in the family Tetraodontidae of order Tetraodontiformes, found along Australia's eastern coast, from northern Queensland to Flinders Island, and around Lord Howe Island, as well as in New Zealand waters. It often buries itself in sand with only its eyes exposed. Like some other fish, the common toadfish is able to vary the amount of pigment in its cornea, which becomes yellow in colour under bright light.