This collage of images from the Smithsonian archives shows six of the species declared extinct, not to exact scale. Freshwater mussels and fish have suffered from a reduction in water quality in U.S. rivers due to human impacts. Photo credit: Smithsonian National Museum of Natural History.
WASHINGTON. The U.S. Fish and Wildlife Service proposed today to remove 22 animals and a plant from the endangered species list because of extinction. They join the list of 650 U.S. species that have likely been lost to extinction.