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"
Comoros thrush Comoros thrush The Comoros thrush ("Turdus bewsheri") is a species of bird in the family Turdidae. It is found in the Comoros Islands in the south western Indian Ocean. The Comoros thrush is a bron bird with olive tinged upperparts, slightly mnore rufous on the tail and wings. The underparts are whitish except for brown flanks and brown scaling on the breast and belly, central belly and undertail coverts are white. The females are browner than the males but otherwise similar, juveniles are more rufous. The length is 24 cm. The song is a typically thrush-like series of melodious, rich