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"
Black-throated thrush Burma. As a vagrant it has occurred in Japan, Thailand, and Taiwan as well as to most of Europe west of its normal range. The scientific name comes from Latin. "Turdus" is "thrush" and the specific "atrogularis" is derived from "ater", "black", and "gula", "throat". Formerly considered conspecific with the red-throated thrush "T. ruficollis" but now considered a separate species. Black-throated thrush The black-throated thrush ("Turdus atrogularis") is a passerine bird in the thrush family. It is sometimes regarded as one subspecies of a polytypic species, "dark-throated thrush", red-throated thrush then being the other subspecies. More recent treatments regard the