The island's fauna include leopard cat, Japanese marten, Siberian weasel, and rodents. Otters were discovered to be living on Tsushima in February 2017. Migrating birds that stop over on the island include hawks, harriers, eagles, and black-throated loons. Forests, covering 90% of the island, consist of broad-leafed evergreens, conifers, and deciduous trees including cypress. Honey bees are common, with many used to produce commercial honey.Nicol, C.W., "Hark ye to the Donkey's Ears", Japan Times, 7 March 2010, p. 12. The Tsushima Island pitviper (Gloydius tsushimaensis) is a venomous snake endemic to the Tsushima Island. The islands have been recognised as an Important Bird Area (IBA) by BirdLife International because they support populations of Japanese wood pigeons and Pleske's grasshopper warblers.
