Iowa zoo expecting rare baby eastern black rhino this fall

Listed as critically endangered by the World Wildlife Fund, Des Moines' rhinos are two of just 46 eastern black rhinos in North American zoos, according to leading zoological nonprofit organization Association of Zoos & Aquariums.

Zoo officials are not sure when the baby will be on display.

"Because the species is so endangered, we want to make sure it is healthy and everything is OK before we put it on exhibit," Scanlon said.