Extensive trading networks between the coastal Tlingits and the interior First Nations developed, where the coastal peoples would trade eulachon oil and other coastal goods for native copper and furs found in the interior. The Yukon was part of the long disappeared Beringia and hosted a wide variety of megafaunal species like steppe wisents, American lions, short-faced bears, woolly mammoths, giant beavers, American mastodons, stag-moose, ground sloths, "Camelops", dire wolves, caribou, muskoxen, saiga, American cheetahs, bison, grizzly bears, "Equus scotti", "Equus lambei", gray wolves and yaks.