system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can some animals be domesticated, while others can’t be?

I saw a video of a “pet” raccoon living in somebody’s house. It was cute. I started looking things up about how raccoons become domesticated. All of the literature said it has never been done, and probably can’t be done. No explanation of why.
gpt
In guns, germs and steel there are six criteria for domestication.

1. The animal needs to be able to eat a variety of different things and be willing to live of human scraps. Even better if they can eat foods we can't like grass. 

2. They must grow up fast or at least faster than humans. This is why despite Asian elephants being tamed for 3000 years they arent considered domesticated. We haven't been able to selectively breed them

3. Animals must be willing to breed in close quarters of captivity. This is why pandas and antelopes are a bad candidate for domestication.

4. The animals have to be pleasant in nature. An animal that is ill-tempered or unpredictable is dangerous. 

5. They also need to be calm and not scared/skittish. Because they are hard to control as well.

6. Animals need to be able to see humans as their master so a social hierarchy is important. 

Even though some individual zebras have been tamed the species is hard to domesticate because of their temperament.

We have also tried to tame or domesticate great white sharks but they will die in captivity. The longest one has been held has been 16 days.