Question: Must a tenant who signs a one-year lease in America affix a mezuzah immediately upon renting his house or apartment?

Short Answer: Many poskim hold that the mezuzos should be affixed immediately, but the brachah should only be recited after 30 days when the tenant removes and re-affixes the mezuzos.

Question: On which birds may you fulfill the mitzvah of Shiluach HaKein?

Short Answer: Unless you know for sure that the bird does not have the signs set forth in the Shulchan Aruch for kosher birds, you should fulfill Shiluach HaKein.