It has been revealed in captivity studies, however, most of the hybrids don t follow Haldane's Rule, but sometimes hybrid females die before they reach sexual maturity this underscores the case for the American black duck being a distinct species.
32.
The male Sumatran rhino died Sunday and a female died on Monday, leaving the Sungai Dusun Sumatran Rhino Conservation Center with just two animals _ both females and both sick, said a spokesman for the Wildlife and National Parks Department.
