The Greenland sleeper shark, also known as the Greenland shark, is a marine animal belonging to the family Nymphalidae in the order Squaliformes. Named after its main distribution area in the waters near Greenland. The Greenland sleeper shark is distributed in the cold waters of high latitudes in the North Atlantic, as well as in the southern hemisphere of South Africa, Argentina, and the Antarctic. The Greenland sleeper shark is a benthic shark species that inhabits deep water environments. In summer, it migrates to shallow or estuarine waters at depths of 180-300 meters, living alone and swimming slowly. Their diet is very diverse, they almost eat whatever they encounter. He is fierce by nature and can also hunt polar bears. The Greenland sleeping shark is not only the largest fish species in cold sea areas, but also the fourth largest shark species in the world

It is a large feline in the mammalian class, with nine subspecies and significant differences in body size and morphology between each subspecies. The Siberian tiger is the largest, with a male body length of up to 3.7 meters and a weight of 423 kilograms. The Sumatran tiger is the smallest living subspecies, with a male tiger measuring 2.34 meters in length and weighing 136 kilograms. Tigers are typical mountain forest dwelling animals that can thrive in tropical rainforests and evergreen broad-leaved forests in the south, as well as deciduous broad-leaved forests and mixed coniferous and broad-leaved forests in the north. Due to human hunting and fragmentation of wild habitats, tigers have become rare and endangered species. A 2016 survey showed that there were 3890 wild tigers worldwide.

It is a large feline in the mammalian class, with nine subspecies and significant differences in body size and morphology between each subspecies. The Siberian tiger is the largest, with a male body length of up to 3.7 meters and a weight of 423 kilograms. The Sumatran tiger is the smallest living subspecies, with a male tiger measuring 2.34 meters in length and weighing 136 kilograms. Tigers are typical mountain forest dwelling animals that can thrive in tropical rainforests and evergreen broad-leaved forests in the south, as well as deciduous broad-leaved forests and mixed coniferous and broad-leaved forests in the north. Due to human hunting and fragmentation of wild habitats, tigers have become rare and endangered species. A 2016 survey showed that there were 3890 wild tigers worldwide.

Nile crocodile, also known as African crocodile, is a large crocodile in the crocodile family of the crocodile order. The adult Nile crocodile weighs up to one ton. The juvenile Nile crocodile is dark yellow brown in color, with obvious horizontal stripes on its body and tail. As an adult, the color of the horizontal stripes becomes lighter. Nile crocodiles are mainly distributed in the Nile River Basin and southeastern regions of Africa, and are also found in Madagascar. They often inhabit freshwater bodies such as lakes, rivers, and swamps. The Nile crocodile is the largest crocodile in Africa and the most studied crocodile among all crocodile species by humans.