Cats usually smell before defecating, then dig a hole, or do the action of digging a hole, and then start defecating in the hole. After that, smell, bury, or do the action of burying, and then smell... Make sure there is no smell of shrimp, go away.
Cats are famous for being clean. They often wash their faces and lick their bodies. PP is done every day. Burying feces is also a sign that cats love to be clean. They are not allowed to leave smelly smell around themselves, so they should be buried. So some people say: This is the nature of cats. Even kittens without big cats will do so when they grow up.
When the ancestors of cats lived in the wild, cats were hunting animals. This can prevent some small animals with sensitive smell from detecting the existence of cats, so they will try their best to cover up their smell and reduce the traces left. Leaving excreta will make other creatures know their existence, so they should be buried and covered. It is not easy for others to find their traces. Burying feces or urinating is to eliminate these odors and avoid being found by prey and frightening them. This is an ancient instinct, so they will bury their poop after going to the toilet.
Although cats are solitary, animals get sick, and poop can show whether they are sick or not. And before they were domesticated, they would hide their tracks in order to prevent bigger and more fierce animals from sneaking into them. Including feces and urine. Although they have been domesticated now, they still maintain their wild nature, so burying feces can also make the enemy unaware of their health, so as to prevent being attacked when they are ill. So when cats don't want to leave a smell, they like to bury their excreta, so they won't be found by other cats.
The reason why the cat is buried with earth after defecating: the main reason is that the cat is clean, hides its tracks and eliminates the threat of the enemy.