Suspected Vitamin D3 toxicity in a group of black rhinoceros (Diceros bicornis)

Three black rhinoceros (two males, one female, Diceros bicornis) in a group of 10 black rhinoceros, (two male and two female long-term wild-caught adults and six male captive-born juveniles) began to show hypercalcemia and partial anorexia over a 5-mo time frame. These signs were more pronounced in the adult rhinoceros, serum sampling in the juveniles were inconsistent due to behavioural...