Was it too late to save the black-footed ferret? Thousands of these furry creatures had once lived on the great plains of North America. Yet by the 1980s, millions of prairie dogs the ferret's main source of food had been killed. Without them, the ferret was suddenly pushed to the brink of extinction. Would people find a way to help this endangered animal survive? In Black-footed Ferrets: Back from the Brink, children relive the inspiring and heroic...