Can science save the northern white rhino from extinction and even bring back the dodo?

Summary: The northern white rhinoceros is one of the world's biggest animals, and one of the most endangered. Only two are known to be alive, both female. But scientific breakthroughs are raising hopes for saving the rhino and perhaps even bringing other animals back from extinction. John Yang reports. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders