Using Science to Resurrect Endangered Species

A three-month-old male Dhole pup named Nicolai is seen at the San Diego Zoo, May 21, 2003. The Wild Animal Park is currently the only facility to house this endangered species in the United States.
( Ken Bohn/Zoological Society of San Diego / Getty )

Produced by Cameron Drews

Hosted by Todd Zwillich

Produced by PRI and WNYC