Zevahim 105: A New Kind of Impurity

When the bulls and he-goats are taken out to get burned and they render the people who handle them impure, what happens if the carcasses need to be brought back through the courtyard? Plus, the question of multiple people carrying a carcass - but the carcass can leave the courtyard before the "back" carriers would be out of the courtyard. And then it boils down to a verse... Also, when a kosher bird imparts impurity - what is the measure needed for it to do so? Plus, a deep dive into Rabbi Meir's opinion, as established in the mishnah. And the question whether the degrees of impurity will kick in, but that kind of impurity starts out as pretty severe to begin with.