Yes, duck is kosher so long as it is slaughtered and prepared following the laws of kashrut.
No ______ Kosher deli meat still has nitrates.
Fox meat is not kosher. See:More about what is and isn't kosher
Yes, Kosher meat is halal for Muslims to eat
I don't know what a guinea fowl is exactly, but duck meat is called duck.
A kosher butcher will only sell kosher meat. Regular butchers don't sell kosher meat.
No. Emu meat is not considered kosher because emu resembles ostriches which are not kosher as well. (The rhea and the cassowary are not kosher for the same reason.)
Sabeny.com is a new kosher online grocery store. They sell a range of Kosher groceries and meat and have a price guarantee. They currently sell fresh and frozen kosher meat and kosher poultry, in addition to all other kosher grocery products.
If Muslims do not have access to halal meat then kosher meat is acceptable.
Meat or poultry should have Rabbinical kosher-certification. So, to answer the question, any meat or poultry that is kosher can be eaten by kosher observant Jews.
Duck!
No. Jewish law forbids the consumption of kosher animals killed by hunters.
An egg and cheese sandwich can be kosher if the the egg, cheese and any other ingredients are kosher and it was prepared in a kosher manner.