Why do cats bury their shit? Why is the cat defecating in the sand?

sihaiwang synthesis: our current domestic cats are domesticated by wild cats. In order to survive, wild cats often ambush their prey. If the prey smells the excreta of the cat, it will escape, and the smell of the excreta will attract powerful natural enemies such as tigers and leopards. So wild cats always like to excrete near their nests, and then bury their feces to reduce the traces left.

Although domesticated by humans, domestic cats still have some habits to keep their ancestors' instincts. They will find a hidden place, and usually a fixed place to defecate. When the defecate is finished, they will bury it carefully with sand.