ENCEPHALOMALACIA IN THREE BLACK RHINOCEROSES {DICEROS BICORNIS)

Fatal encephalomalacia occurred in three female black rhinoceroses (Diceros bicornis) from three different zoos over a 9-yr period. Rhinoceroses affected included two calves (2 and 6 mo old) from the Denver and St. Louis Zoological Parks and a 2-yr-old from the Kansas City Zoo. Evaluation of the three rhinoceroses for known causes of encephalomalacia in domestic hoofstock failed to provide a definitive diagnosis.