Carnivores Spread Distemper to Lions New research shows that dogs are no longer the primary source of a disease that has infected and killed lions in Tanzania. Canine distemper now appears to be spread mostly by other carnivores, such as hyenas, jack

发表于:2018-12-08 / 阅读(39) / 评论(0) 分类 VOA标准英语2015年(一月)