Kauai Cave Wolf Spider
The endangered Kauai Cave Wolf spider gets its name from its one lifelong habitat: the caves of Hawaii, where its born, lives, hunts, and dies.
The spiders are so accustomed to life in the pitch-black caves that they are no longer born with eyes; they feel out food using chemically-based senses. But since the spiders only live in the underground tunnels of Kauai, they are endangered as a result of habitat loss and pollution.
Image: US Fish & Wildlife Service / Creative Commons