Brain › AnimalsThroughout the period from the 1970s to the end of the 20th century, the rhinoceros numbers declined by approximately what percentage?50%90%60%75%AnswerThe correct answer is B) 90%.More Animals questionsWhat is the life span of a rhino?What is the gestation period of a rhino?What is the #1 reason for the rhinos decline worldwide?Hyenas are most closely related to what creatures?In which of these African environments are hyenas NOT found?Which of these is not a species of hyena?Play Brain · Practice