There are three subspecies of the Aoshima duck, Anas aucklandica.
Oshima ducks nest in dense coastal vegetation. The main activity time is dusk to night, feeding on Marine invertebrates, but also eating insect larvae and coastal small mollusks or algae and algae.
During the breeding season, the Oshima duck flock consists mainly of subadult and adult birds. The annual reproduction rate is low, from late October, 3-4 eggs are laid per nest, and the first chicks are seen hatching in December. Captivity takes longer than the wild, with hatching completed in 30 to 35 days and parental care and feeding for 60 to 70 days.
Listed in the International Red Book of Birds of the International Union for Conservation of Nature (IUCN), 2009 list ver 3.1 - Vulnerable (VU).
Listed in Appendix I, Appendix II and Appendix III of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) 2019 edition and the Regulation on the Protection of Endangered Species of Animals and Plants.
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