Modern zoos and aquariums around the world specialize in captive breeding endangered species, they care for living collections of animals and help safeguard against their extinction. Our own project is a partnership between the Smithsonian’s National Zoo and Conservation Biology Institute, Cheyenne Mountain Zoo, Zoo New England and the Smithsonian Tropical Research Institute. This explainer video captures some of what zoos and aquariums around the world have been doing to breed endangered species.