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Kauai Wolf Spider
The Kauai cave wolf spider (Adelocosa anops) is one of the rarest creatures on the planet, as it lives in a small cave in Hawaii and unlike other arachnids of the same species (Lycosidae, wolf spider or tarantula) that they have many eyes (generally 8 or more), this one has adapted to living without them.
This species of amphibian (Atretochoana eiselti) was discovered in the Amazon River and some of its tributaries in 2012. Although it may look like a snake, it is actually a closer relative to the salamander and has shocked the scientific world as it is capable to live without eyes or lungs.
Kentucky shrimp (Palaemonias ganteri) live only in Kentucky's Mammoth Cave. These tiny creatures are eyeless thanks to their powers of adaptation and rely on their other senses to overcome the intense darkness of their abode. Unfortunately, since all members of the species are concentrated only in that area, they are at high risk of extinction (in degree of vulnerability) due to the contamination of its waters.
Researchers initially believed that the sea urchin (Echinoidea) could see by changing color or spasming in response to light, but after several studies it was concluded that it produces a light-sensing protein, which helps it find the source of it.
Giant tube worm
This blind worm (Riftia pachyptila) inhabits the abyssal depths inside chitinous capsules and has a highly vascularized red "feather", which provides essential nutrients to the bacteria that live inside the creature in symbiosis, since it is not only blind , but lacks a digestive system. These bacteria (which can account for half the creature's body weight) convert oxygen, hydrogen sulfide, carbon dioxide, and other substances into organic molecules that host worms feed on.
Hydras (Hydridae) are miniature relatives of jellyfish and do not need eyes as they live in the deep sea. Scientists could not understand how it was able to move and hunt without the sense of sight, but it was later discovered that they have a light and motion sensing protein on the tips of their multiple, polyfunctional tentacles.
Also called the albino crab of the Jameos (Munidopsis polymorpha), it is endemic to the homonymous caves located in Lanzarote, one of the Canary Islands. Little is known about this species, except that it has lost pigmentation and sight as it evolved and adapted to its environment. Scientists can't even agree on whether it's a very small crab or lobster.
Olm The olm (Proteus anguinus) is a European salamander that has amazed scientists with its adaptive abilities, as it compensates for its blindness with other senses, which are much better developed than those of surface-dwelling amphibians. It has a long, slender body and a large, flattened head, the latter allowing it to possess a greater number of sensory receptors that have been developed to replace sight. It can live up to 100 years.
Naked mole rat This mammal also called Farumfer (Heterocephalus glaber) does have eyes, but they are merely decorative, so it uses its other senses that it has developed in an incredible way, since it lives in complete darkness. It is extraordinarily long-lived, it feeds on tubers and roots (it is considered a pest in certain African countries) and in addition to its sight, also due to its adaptation to living underground, it has lost its hair.
Texas blind salamander After years of dwelling in the groundwater of some caves in Texas where it is endemic, this salamander (Eurycea rathbuni) decided that eyes were an unnecessary accessory and evolved to the point of losing them completely. Instead of sight, it uses the extreme sensitivity of your skin to detect pressure and movement in the water.
Mexican Tetra This blind fish (Astyanax mexicanus) lives in Mexican caves and underground lakes and is a very clear example of adaptation, since they use water pressure to move. Surprisingly, despite the fact that these fish have been blind for many generations, they can occasionally produce sighted offspring.
Star-nosed mole His complete blindness does not prevent him from obtaining food very quickly. This little mole (Condylura cristata) uses tendrils in its snout, which can point to thirteen different points per second, to probe the surrounding area and "feel" the presence of its food (worms, insects or small crustaceans).