Song thrush thrush recognizes the cuckoo's non-mimetic eggs. However, the song thrush does not demonstrate the same aggression toward the adult cuckoo that is shown by the blackbird. The introduced birds in New Zealand, where the cuckoo does not occur, have, over the past 130 years, retained the ability to recognise and reject non-mimetic eggs. Adult birds may be killed by cats, little owls and sparrowhawks, and eggs and nestlings are taken by magpies, jays, and, where present, grey squirrels. As with other passerine birds, parasites are common, and include endoparasites, such as the nematode "Splendidofilaria (Avifilaria) mavis" whose specific name "mavis"
Eastern slaty thrush a browner version of the male's pattern. The song is high-pitched and has an unusual metallic, scraping quality. It inhabits forest, woodland and parks. Its breeding range covers north-east Argentina, eastern Paraguay and southern Brazil. Some birds migrate north in winter as far as central Brazil. Eastern slaty thrush The eastern slaty thrush ("Turdus subalaris") is a passerine bird belonging to the genus "Turdus" in the thrush family, Turdidae. It is native to eastern South America. It is often considered to be a subspecies of the Andean slaty thrush ("T. nigriceps"). It is 21 centimetres long. The male has dark