Orthonyx kaldowinyeri is an extinct species of logrunner from the Late Oligocene to the Miocene of Australia. It was described by Walter Boles from fossil material (a complete left femur) found at the Last Minute Site of Riversleigh, in the Boodjamulla National Park of north-western Queensland. It was a relatively small logrunner. The specific epithet kaldowinyeri is an Aboriginal term for “old”, referring to the Miocene age of the species which is earlier than that of other members of the genus. References kaldowinyeri Oligocene birds of Australia Miocene birds of Australia Riversleigh fauna Fossil taxa described in 1993