Why Is Black Rhino Endangered. 1 why black rhinos are endangered? A subspecies of this black rhinoceros, the western black rhinoceros was declared extinct in 2011 by the iucn. Why Is The Black Rhino Endangered Danger Choices from dangerchoices.blogspot.com Between 1970 and 1993, the population of black rhinos decreased by 96% from approximately 65,000 to …