The hide, the gravy, the spices, the shreds, the bones, the gidin, the horns, and the hooves combine to convey the tumah of foods but not the tumah of neveilos. Similarly, [if] one slaughters a nonkosher animal for a gentile and it [still] convulses, it conveys the tumah of foods but not the tumah of neveilos until it dies or until he chops off its head. [Scripture] has provided for more things that convey tumah of foods than that convey tumah of neveilos. R’ Yehudah says: Shreds that were gathered together, if there is the volume of an olive in one place, one is liable on its account.