Summary: The Animal Welfare Institute (AWI) formally requests that the United States Fish and Wildlife Service (USFWS) list the pygmy three-toed sloth (Bradypus pygmaeus) as endangered under the federal Endangered Species Act (ESA) on an emergency basis. Alternatively, if the USFWS determines that an emergency listing is not warranted in this case, AWI requests that it process this listing petition pursuant to the standard timetable as required under the ESA.