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"
African thrush are white. It has a yellow-orange bill. It weighs 46–78g and measures 21–23 cm in length. The song of the African thrush is a sustained, clear warbling made up of different phrases repeated rather randomly in a sequence. Also a high-pitched squealing flight call. The African thrush is distributed from Senegal and Gambia in the west to South Sudan, Ethiopia and Eritrea south to northwestern Zambia and western Angola. The African thrush can be found in all sorts of wooded habitats including forest edge, riparian woodland, scrub cultivation, parks and gardens. The African thrush is normally encountered either singly or