Yes, there are a number of endangered species in US zoos. According to the World Wildlife Fund, there are currently more than 1,500 species of animals listed as threatened or endangered in the US. Zoos are working hard to help protect these species, both in captivity and in the wild. For example, the San Diego Zoo has been successful in breeding endangered species such as the California condor, the black-footed ferret, and the giant panda. Other zoos are also actively involved in conservation efforts, such as reintroducing endangered species into the wild and helping to protect their habitats.