1. It must be a kosher animal (cow, deer, giraffe, sheep, buffalo, chicken, duck, goat, turkey) slaughtered in accordance with Jewish law, by someone trained in the field. The animal must not be stunned, the cut through the neck must be quick and clean and fast. There are very detailed rules that must be learned. The animal's lungs (if a mammal) must be examined to ensure that the animal is healthy.
2. The blood must be drained, then the meat must go through a process known as soaking and salting within three days of slaughter.
3. It must be cooked in kosher utensils that have not been used for dairy products.
There are other rules but those are the basics.
No ______ Kosher deli meat still has nitrates.
No.
Fox meat is not kosher. See:More about what is and isn't kosher
Yes, Kosher meat is halal for Muslims to eat
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.
Please see the related link for the history of the 1902 kosher meat boycott.
A vegan kosher menu.
Hindus do not eat beef no matter if it is Kosher or non-kosher.