Julie Larsen Maher © WCS

Since its inception, WCS has worked to save the American bison from extinction, and the Bronx Zoo grounds have housed bison for over one hundred years. Today, new conservation efforts focus on genetic purity in this iconic mammal. Listen and learn as Dr. Pat Thomas, Associate Director of the Bronx Zoo, discusses the birth of the first genetically pure American bison calf produced by embryo transfer.