Reincarnation.
Many people say that at the end of life, when they are reborn again, they want to be born as animals, not humans. Everyone has their own but there is definitely a desire. But to be honest nothing like that happens. This is just expressing an opinion. Everyone thinks animals are happier than humans. That's why everyone wants next time to be born as the animal they want. This life has many wounds in heart, stomach, brain .
A very atypical version, although quite well-known, it is possible to become an animal during life, it is much more difficult to be a person during life and remain so after death