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"
Himalayan thrush Tibet and further east into northwest Yunnan in China. The species differs in its song from that of the alpine thrush. The Himalayan thrush has a more musical call while that of the Alpine thrush is raspy and grating. The species name is given in honour of the distinguished Indian ornithologist Sálim Ali. The tree-dwelling species has shorter legs, tail and wings but a longer bill than its Alpine counterpart, and uses the shorter legs and tails to help it manoeuvre around in the forest. Himalayan thrush The Himalayan thrush or Himalayan forest thrush ("Zoothera salimalii") is a species of