Why is "0 sausages" plural? What is -4 sausages?

one sausage is singular, two sausages is plural and hence the s on the end. Why is zero sausages plural, why add the s, there are not more than one of them? And further more, nobody can have minus 4 sausages, so again, why the plural? You can owe 4 sausages, but you never have minus for sausages; there is no such thing as a negative sausage that you can have, unless you are talking about antimatter. So what i am saying is i don't get how language is working here. Please help!!