Does any species eat its own species?

Like would a spider eat a spider for food? I'm high and just thought of this question. Its stuck in my head and google didn't. Wtf google. I'm trippin out on this question hahaha its a trip! Oh another question out of random thinking. Is it illegal to eat human flesh? Like if that person said it was ok and you could kill and eat them. Would you go to jail if you did it? I wonder what it taste like. I need to find someone to kill......