Related zu Ijow 5:23

Mules of uncertain parentage are forbidden [one with another,] And a ramakh is permitted. Wild man-like creatures are [in the category of] hayyah. Rabbi Yose says: they cause impurity in a tent like a human being. The hedgehog and the bush-mole are [in the category of] hayyah. The bush-mole: Rabbi Yose says in the name of Bet Shammai: an olive's size [of its carcass] renders a person carrying it unclean, and a lentil’s size [of its carcass] renders a person touching it unclean.