Endemic species are those that are native and exclusive to a particular area. The following species are endemic to the Olympic Peninsula.
Mammals
Olympic marmot - Marmota olympus
Olympic yellow-pine chipmunk - Tamias amoenus caurinus
Olympic snow mole - Scapanus townsedii olympicus
Olympic Masama pocket gopher - Thomomys mazama melanops
Olympic ermine - Mustela erminea olympica
Amphibians
Olympic torrent salamander - Rhyacotriton olympicus
Fish
Olympic mudminnow - Novumbra hubbsi
Lepidoptera (butterflies and moths)
Hulbirt's skipper - Hesperia comma olympica
Orthoptera (grasshoppers)
Olympic grasshopper - Nisquallia olympica
Coleoptera (beetles)
Mann's gazzelle beetle - Nebria danmanni
Quileute gazelle beetle - Nebri acuta quileute
Tiger beetle - Cicindela bellissima frechini
Mollusks
Arionid slug - Hemphllia dromedarius
Arionid jumping slug - Hemphillia burringtoni
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