To feed a baby nyala, you need to make a special formula that combines cow's milk, egg yolk, cream and a digestive bacteria called protexin. Then the nyala needs to weighed and fed exactly twenty percent of his bodyweight in formula. To make matters more complicated, the formula needs to be exactly 100.4 degrees Fahrenheit. Otherwise, the nyala's sensitive digestive system will reject the formula, and it could end up in the rumen, the nyala's first stomach that isn't functional yet. Inside the undeveloped rumen, the formula could ferment and ultimately kill the nyala. Besides needing formula at exactly the right temperature, the baby also has to be fed every three hours, even throughout the night.