When, where? Generally, Jewish table manners parallel those of non Jews in the same countries. In post Midieval Europe, Jews eat with knives and forks while sitting at tables. In most Arab lands, Jews ate and a few still eat sitting on the ornate rugs on the floor while using their fingers. In Roman and Persian times, Jews ate off of low tables while reclining on couches. The later part of Talmud Tractate Brachot testifies to this while discussing the appropriate mealtime prayers.
Jews who eat kosher will not eat snails since snails are not kosher. However, not all Jews eat according to the laws of kashrut, so some Jews do eat snails.
Observant Jews do not eat crayfish.
Muslims and Jews don't eat pork. Muslims eat shellfish, but Jews don't.
Orthodox Jews are only allowed to eat kosher foods.
Jews eat food -- observant Jews attempt to keep the laws of kashrut by eating kosher food. When? Many Jews eat 3 meals a day with occasional snacks. Some skip breakfast.
no, it is because God's Torah forbids Jews to eat pork. Non-Jews are permitted to eat it.
Yes, Jews can eat chicken. Religiously observant Jews would require that the chicken be kosher.
Yes, Jews; as well as Muslims; can eat duck meat,
Religiously observant Jews will only eat foods that are kosher.
The Torah states that Jews should eat kosher food.
There is no food that all Jews eat by dint of the fact that all Jews are different people with different tastes and choices.
Religiously observant Jews will only eat in restaurants that are kosher certified.