Elephants are mammals in the family Elephantidae, belonging to two genera, and are the largest terrestrial animals in the world. Its pillar like limbs and wide feet can stably support its massive body. Elephants are very intelligent, highly social, and good at learning, so they are often domesticated by humans. Elephants have been listed as one of the top ten species most threatened by trade activities in the world. In order to protect endangered elephants, countries such as Kenya have called for a 20-year ban on ivory trade, curb illegal ivory trade, punish poaching, and prevent elephant extinction.

It is a species of bear in the family Ursidae and is the largest terrestrial carnivore in the world, also known as the white bear. The body is large and robust, with a shoulder height of up to 1.6 meters. Polar bears live in waters covered by ice in the Arctic Circle. The depth of winter caves can reach the permafrost layer. The preferred habitat is the floating ice in the Arctic Ocean. The fractured and refrozen ice edges and pressure ridges provide the best hunting grounds. Generally acting alone, except during mating and lactation periods. The main prey is seals, and even larger species such as walruses and beluga whales. It also preys on seabirds, fish, small mammals, and sometimes cleans up carrion.