Reference for Kilayim 8:5
הַפְּרוּטִיּוֹת אֲסוּרוֹת, וְהָרַמָּךְ מֻתָּר. וְאַדְנֵי הַשָּׂדֶה, חַיָּה. רַבִּי יוֹסֵי אוֹמֵר, מְטַמְּאוֹת בָּאֹהֶל כָּאָדָם. הַקֻּפָּד וְחֻלְדַּת הַסְּנָיִים, חַיָּה. חֻלְדַּת הַסְּנָיִים, רַבִּי יוֹסֵי אוֹמֵר, בֵּית שַׁמַּאי אוֹמְרִים, מְטַמֵּא כַזַּיִת בְּמַשָּׂא, וְכָעֲדָשָׁה בְּמַגָּע:
<i>Perutiyot</i> [mules that we cannot be sure whether its mother was a horse or a donkey] are forbidden [with each other], but the <i> ramakh</i> [a mule whose mother is a horse] is permitted. <i>Adnei Hasadeh</i> [man-like creatures] are like wild animals [the laws of wild animals apply to them, i.e.they do not impart uncleanliness in a tent]. Rabbi Yosi says, They convey uncleanliness in a tent like a human being. The hedgehog and the weasel of the bushes are [considered] wild animals. [With regard to the] weasel of the bushes, Rabbi Yosi says, Beit Shammai say, the size of an olive [of its carcass renders the person carrying it] impure, and the size of a lentil [of its carcass] renders the person touching it impure.