According to conservationists, there are many animal species – for example, the Sumatran Tiger and the Giant Panda – nearing extinction due to human activities. But humans have already wiped out many animal species. During the great human territorial expansion of the past few hundred years, they were hunted to extinction or forced out by habitat change. Others could not compete with the vermin and pets that accompanied humans to once-isolated regions. Here are some of the notable - and sad - examples of animals that have been wiped out by man.