The Amur leopard is certainly one of the rarest cats with no more than 90 individuals surviving in the wild in the Russian Far East. There may be even fewer Iranian cheetahs remaining in the wild, but the data on the Iranian cheetah is lacking due to the challenges of conducting fieldwork in a politically unstable region., Basal non-mammalian synapsids ("mammal-like reptiles") traditionally also sort under class Reptilia as a separate subclass, [27] but they are more closely related to mammals than to living reptiles. Considerations like these have led some authors to argue for a new classification based purely on phylogeny , disregarding the anatomy and physiology., Another fascinating example is the herds of European bison. Although the females are smaller than the males, they hold higher positions in the social hierarchy of the herd. There are multiple other animals that we can say live in matriarchal communities, and this article will deal with some of them. 10. Lemurs, At least hundreds of so-far unidentified species of mammals are hiding in plain sight around the world, a new study suggests. Researchers found that most of these hidden mammals are small bodied , They can hold their breath for more than 100 minutes [17] [18] – longer than any other noncetacean mammal. Elephant seals dive to 1,550 m (5,090 ft) beneath the ocean's surface [ 17 ] (the deepest recorded dive of an elephant seal is 2,388 m (7,835 ft) by a southern elephant seal, while the record for the northern elephant seal is 1,735 m , .