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Range DescriptionCalonectris leucomelas is found in the western Pacific, breeding on the coast and on offshore islands of Japan, Russia, and on islands off the coasts of China, North Korea and South Korea. It migrates south during winter, being found off the coasts of Vietnam, New Guinea, the Philippines and Australia (del Hoyo et al. 1992). The global population has been estimated to number c.3,000,000 individuals (Brooke 2004). In Japan, where it is thought that the majority of the speciesâs world population breeds, there are 11 islands that are each inhabited by more than 10,000 breeding pairs (Oka 2004). According to islanders, the species appears to have been declining rapidly on Mikura-jima, but quantitative data are not available (S. Uematsu in litt. 2012). The prevalence of threats from introduced predators suggests that the species is in overall decline; however, further data are required from throughout the speciesâs range to assess the current population trend.