A freshwater snail in Missouri is now believed to be extinct according to the United States Fish and Wildlife Service.
The Ozark Pyrg, a small snail native to Missouri and Arkansas, is presumed extinct after none have been confirmed in surveys since their first discovery in 1915.
As of December of 2018, the snail is no longer listed under the Endangered Species Act.
It is believed that dams constructed in the 1940s drastically changed their habitats to survive and reproduce.