TT #94 · Parshas Shemini · Aliyah 5 · Passuk 3
Chabad.org — Vayikra Chapter 11 with Rashi
English: “Every animal that parts the hoof”: the Sages list signs of a pure animal, including absence of upper teeth, split hooves, and flesh that moves lengthwise and crosswise.
Chullin 59a.
E-Daf.com — Chullin 59a (Tsurras Hadaf)
כָּל מַפְרֶסֶת פַּרְסָה וְגוֹ׳. תָּנוּ רַבָּנַן, אֵלּוּ הֵן סִימָנֵי בְּהֵמָה טְהוֹרָה, כָּל בְּהֵמָה שֶׁאֵין לָהּ שִׁנַּיִם לְמַעְלָה וְכָל בְּהֵמָה שֶׁפַּרְסוֹתֶיהָ סְדוּקוֹת וְכָל בְּהֵמָה שֶׁבְּשָׂרָהּ מְהַלֵּךְ שְׁתֵּי וָעֵרֶב.
Textual classification — The Chazal derives the teaching from the wording or classification in the verse.
The note supplies additional identifying signs by which a kosher animal can be recognized when the primary signs in the verse cannot be directly inspected.