Scientists at a new National Zoo laboratory use DNA to diagnose illnesses and discover new species of animals In Video / 30 September 2010 Related posts: Cats Don’t Roam in Places Coyotes Call Home Patience and research may bring lion cubs to the National Zoo Seven lion cubs born recently at the National Zoo National Zoo veterinarian Katharine Hope is in charge of the health of 2,000 animals from 400 different species. Tags: conservation, endangered species, mammals, new species, reptiles, Smithsonian's National Zoo, veterinary medicine