Spotted Catbirds are intermediate forms between the Green Catbird from further south and the Black-eared Catbird of New Guinea. They occur in north Queensland in two slightly different-looking populations - a darker one from Iron Range and the McIlwraith Range on far north Cape York and a separate one between Helenvale and Paluma.

All these forms are often regarded as a single species, so their life histories would all be very similar. See under Green Catbird.