Extracted from text ... To the editor - Aan die redakteur Suspected calcium oxalate raphide irritation in a black rhinoceros (Diceros bicornis) due to ingestion of Xanthosoma mafaffa We wish to record a case of buccal irrita-tion in a black rhinoceros, 'Chewore', due to chewing of Xanthosoma mafaffa at the Tashinga Camp, Matusadona National Park, Kariba, Zimbabwe, on 27 April 1995. The rhinoceros was approximately 12 months old and weighed 385 kg. The incident occurred when she ate an ornamental elephant-ear plant from a garden. About half a leaf was chewed and spat out; nothing was swallowed. The time from intake to onset ..