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"
Song thrush a red underwing in flight. The mistle thrush ("T. viscivorus") is much larger and has white tail corners, and the Chinese thrush ("T. mupinensis"), although much more similar in plumage, has black face markings and does not overlap in range. The song thrush has a short, sharp "tsip" call, replaced on migration by a thin high "seep", similar to the redwing's call but shorter. The alarm call is a "chook-chook" becoming shorter and more strident with increasing danger. The male's song, given from trees, rooftops or other elevated perches, is a loud clear run of musical phrases, repeated two to