The Bonin thrush, Bonin Islands thrush or Kittlitz's thrush (Zoothera terrestris) is sometimes separated as the only species of the genus Cichlopasser. It is an extinct species of Asian thrush. The only place where this bird was found was Chichi-jima in the Ogasawara Islands; it might conceivably have inhabited Anijima and Otōtojima, but this has not been borne out by observations or specimens. The species was only once observed by a naturalist, its discoverer Heinrich von Kittlitz. He encountered the thrush in the coastal woods where it usually kept to the ground; it may have been ground-nesting. The only specimens ever taken are in the Naturalis in Leiden (1), the Naturhistorisches Museum in Vienna (1), the Senckenbergmuseum in Frankfurt (1) and in the Zoological Museum, St. Petersburg (