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States with the most endangered species

  • #30. Maryland

    - Total endangered species: 21
    - Notable species:
    --- Hay's Spring amphipod (scientific name: Stygobromus hayi, IUCN category: endangered)

    The Hay's Spring amphipod is a tiny crustacean found only in Rock Creek Park in Maryland and the District of Columbia. Because it spends its whole life in underground springs, it’s colorless and blind, and highly susceptible to habitat disturbance, including flooding from urban runoff around the park.

  • #27. Louisiana (tie)

    - Total endangered species: 24
    - Notable species:
    --- Louisiana pinesnake (scientific name: Pituophis ruthveni, IUCN category: endangered)
    --- Ringed map turtle (scientific name: Graptemys oculifera, IUCN category: vulnerable)

    Once more widely found in Texas and Louisiana, the Louisiana pinesnake is now restricted to only about a third of its original distribution, and is considered one of the rarest snakes in North America. It’s threatened by loss of its pine savannah habitat, which has been nearly eliminated by logging, and by other human impacts, including frequently being killed by cars. It reproduces slowly, making it difficult for populations to recover. Conservation efforts include assistance for private landowners to manage habitats that support them.


  • #27. New York (tie)

    - Total endangered species: 24
    - Notable species:
    --- Chittenango ovate amber snail (scientific name: Succinea chittenangoensis, IUCN category: data deficient)

    The Chittenango ovate amber snail is found only at one waterfall in Chittenango State Park in New York State. Once abundant, the population was down to under 25 in 1990. It’s affected by water quality degradation from runoff from roads and farms, human disturbance, and competition from a closely-related species that is thought to have been introduced by accident. A captive breeding program has successfully released some snails into their native habitat.


  • #27. Wisconsin (tie)

    - Total endangered species: 24
    - Notable species:
    --- Fassett's locoweed (scientific name: Oxytropis campestris var. chartacea)

    Fassett's locoweed is found only in three counties in Wisconsin. It grows on open sandy shores of lakes when fluctuating water levels are low; in years with high water levels it may not appear. A project based at the University of Wisconsin is working to propagate seedlings and plant them in a suitable habitat.


  • #26. Michigan

    - Total endangered species: 25
    - Notable species:
    --- Hungerford's crawling water beetle (scientific name: Brychius hungerfordi)
    ---    (scientific name: Mimulus michiganensis)
    --- Dwarf lake iris (scientific name: Iris lacustris, IUCN category: near threatened)

    The Dwarf lake iris is found only around the Great Lakes, growing close to the shoreline in sandy soil. It has lost habitat due to development for vacation homes and recreation, and associated road construction and chemical use. In addition, it is sold for gardening use and may be illegally collected from the wild.

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  • #24. Indiana (tie)

    - Total endangered species: 26
    - Notable species:
    --- Rayed bean (scientific name: Villosa fabalis, IUCN category: endangered)

    The rayed bean is a small mussel, only about an inch and a half long. Once found in 115 locations in streams and lakes, it had lost 73 percent of its range—down to 32 locations—when it was listed as endangered in 2012. It’s been affected by pollution, competition from the invasive zebra mussel, and the construction of dams, which disrupt water flow, temperature, and river bottoms, and block the movement of fish that help move the mussels around.


  • #24. Ohio (tie)

    - Total endangered species: 26
    - Notable species:
    --- Scioto madtom (scientific name: Noturus trautmani, IUCN category: extinct)

    Only 18 individuals of this small catfish have ever been seen, all along the Big Darby Creek in central Ohio. It was last seen in the wild in 1957 and is likely extinct, but is still kept on the federal endangered species list so that if any populations were to be discovered they would be protected.


  • #23. West Virginia

    - Total endangered species: 29
    - Notable species:
    --- Diamond darter (scientific name: Crystallaria cincotta, IUCN category: critically endangered)

    The only known population of the diamond darter is found in the Elk River in West Virginia, a biodiversity hotspot that is home to over 100 species of fish and 30 species of mussels. The small fish was once more widespread, but much of its habitat was destroyed by the construction of dams. The remaining habitat is threatened by human activities that affect water quality, including coal mining, oil and gas drilling, and recreational uses.


  • #22. Washington

    - Total endangered species: 30
    - Notable species:
    --- Columbia Basin pygmy rabbit (scientific name: Brachylagus idahoensis, IUCN category: least concern)
    --- Island marble butterfly (scientific name: Euchloe ausonides insulanus)
    --- Showy stickseed (scientific name: Hackelia venusta)

    The last known wild population of this subspecies of pygmy rabbit was gone by 2004, probably due to habitat loss and fragmentation. The last 16 remaining in captivity became part of a breeding program, but because there were so few of them, it was necessary to crossbreed with another species of pygmy rabbit. The first wild litter from the reintroduction program was born in 2011, and the program concluded in 2012, when the last 14 remaining breeding adults and their offspring were reintroduced.


  • #21. Colorado

    - Total endangered species: 33
    - Notable species:
    --- Knowlton's cactus (scientific name: Pediocactus knowltonii, IUCN category: critically endangered)
    --- Gunnison sage-grouse (scientific name: Centrocercus minimus, IUCN category: endangered)
    --- Whooping crane (scientific name: Grus americana, IUCN category: endangered)

    Knowlton’s cactus is found only in one small area on the border of New Mexico and Colorado. Its miniature size made it attractive to collectors and easy to conceal, so it was at one point reduced to only 1% of its original numbers due to poaching. Propagated specimens have been successfully transplanted to two new areas, but the species is still at risk from illegal collection and oil and gas development.

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