The Wyoming toad (which is also known as Baxter's toad) is an amphibian that has become rare, and only exists in captivity. It is bread at the Mortenson Lake National Wildlife Refuge in Wyoming. It was listed as "endangered" in 1984, and as "extinct in the wild" i 1991. The population crashed around 1975 and was extremely rare by 1980. To prevent extinction, a captive breeding program was begun in 1989 at the Thorne Williams Unit. This program produced enough offspring in the first few years to supply seven different zoos, and in 1998 the Saratoga National Fish Hatchery received captive breeding stock. Between 1995 and 2006, when the remaining captive stock was moved from the Thorne Williams Unit to the Red Buttes Environmental Biology Laboratory south of Laramie, nearly 46,000 offspring were produced at the Thorne Williams Unit and released back into the wild. Before the sharp declines occurred, this toad was classified as a subspecies of the Canadian toad.