The Izu thrush is on the Red List of Japan, which means that its conservation importance is recognised (3). The Izu Islands lie within the Fuji-Hakone-Izu National Park (5), and several places have been designated as “special protected areas”, but there are no park rangers, and the destruction and alteration of habitat continues on many of the islands (4). The maintenance of suitable forest habitat is important for the conservation of the Izu thrush, and thus enforcement of the National Park is essential. This is required in addition to the control of predators, for example, by introducing new controls on the dumping of garbage to reduce the numbers of large-billed crows (3).