"Unclean" is actually a mistranslation of the Hebrew word taref (טרף), from the King James Bible. The word should actually be translated as "unusuable" or "unkosher".
In other words, Jews believe that some animals are not food animals. It's as simple as that.
Dietary restrictions are listed in the Hebrew Bible, but Jews believe these laws only apply to Jews.
Pork is the most common, but religious Jews refuse to eat any meat that does not accord with the requirements of Kashrut.
They eat any kind of meat except for pork. However, it MUST be kosher.
Meat and dairy.
Kosher meat comes from those land animals which have split hooves and chew their cud (such as beef and mutton).
Meat and dairy.
Yes.
It's considered not kosher to eat meat and dairy together.
Yes, there's no prohibition against drinking cow's milk in Judaism. The only time we don't drink milk of any kind is when we are eating meat or within 6 hours of eating meat.
no, fish is not meat under Jewish law.
Meat and dairy
Jewish people do eat meat, although the meat of some animals is considered unfit for consumption in accordance with the Torah.
meat
They see the killing of those animals as a form of cruelty, and refuse to partake in the result of such.