How does the carcass of a kosher fowl (nivlat of tahor) impart its primary (severe) impurity?
Halacha 1: the carcass of a kosher fowl imparts its severe impurity specifically in the gullet (beit habeliyah) at the moment of swallowing — not by touch or carrying.
Question 2
If one swallows an olive of kosher fowl carcass and then vomits it before digestion — does the vomiting create new impurity?
Halacha 6: the impurity of a kosher fowl carcass applies only when it is in the gullet during swallowing — not when being vomited back up.
Question 3
Which part of a fowl carcass does NOT combine toward the required olive-sized measure for gullet impurity?
Halacha 9: feathers and wooly hairs do not combine toward the olive measure for kosher fowl carcass impurity, even though they can impart food-level impurity on their own.
Question 4
A kosher fowl declared tereifah (mortally wounded) was then properly slaughtered. What is its status regarding impurity?
Halacha 12: proper ritual slaughter of a kosher tereifah fowl purifies it from carcass impurity — even if slaughtered in the Temple Courtyard.
Question 5
Does a limb separated from a living bird (eiver min hachai) impart impurity?
Halacha 14: the verse specifies 'all the animals' (referring to those with hooves), explicitly excluding birds from the law of eiver min hachai — a limb from a living bird is completely pure.