Internationally important species

The area around Kaminoseki has several internationally important species. Finless porpoises live and rear young in this part of the Seto Inland Sea. Finless porpoise populations have been in decline in most parts of the Seto Inland Sea and there are currently only about 15% of 1990 numbers. However, in the area around Kaminoseki, numbers have been better maintained with around 40-90% of 1990 numbers. This is probably due to this part of the Inland Sea having been kept in a relatively pristine condition in comparison to other areas. Finless porpoises are listed on the IUCN Red List as "vulnerable".

The Japanese murrelet is a seabird also listed as "vulnerable" on the IUCN Red List. These birds live in the Kaminoseki area and it is also possibly a breeding area - a nest of chicks was found in 2008. The Japanese murrelet is in decline partly due to the disturbance of nesting sites.

The Japanese wood pigeon is also living in this area. This bird is listed as "near threatened" on the IUCN Red List. There is a relatively small population of these birds and numbers are declining due to loss of habitat.

Peregrine falcons are nesting and breeding in the area. There were only 200-300 pairs of this bird in the whole of Japan in the 1990s.

Many kinds of molluscs are found in this area especially in Tanoura - the cove that would become landfill if Chugoku Electric Company's plans go ahead. The Tomura cf. Yashima has been identified on only four occasions and is probably endemic to Kaminoseki and possibly endemic to Tanoura. (See entry on Molluscs in Tanoura.)

Plant species in the area that have been listed in the Red List of the Japanese Ministry of Environment include Chinese juniper, Chinese dunce's cap, silver cloak fern and ferny azolla.

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