Lion and spotted hyena have also recently been re-introduced to the area. However, rank reversals and overthrows in spotted hyena clans are very rare. Studies strongly suggest convergent evolution in spotted hyena and primate intelligence. There are also spotted hyena near the big cat complex. Lions kill other predators such as leopard, cheetah and spotted hyena but seldom consume them. The Maasai Mara is a major research centre for the spotted hyena. Female spotted hyena are also more aggressive than the male spotted hyena. The ear is typical of the spotted hyena, as it is rounded. There are predators such as spotted hyena, striped hyena and African leopard. The spotted hyena is widespread and fairly common. Nevertheless, some fall prey to large carnivores, especially the spotted hyena. African rock python was filmed eating a small adult female spotted hyena weighing . The main predator of the calves is the spotted hyena. The female spotted hyena does not have an external vaginal opening. The spotted hyena is the most carnivorous member of the Hyaenidae.