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Mishnah Chullin
The characteristics of cattle and of wild animals are stated in the Torah. The characteristics of birds are not stated, but the sages said: every bird that seizes its prey is unclean. Every bird that has an extra toe, or a crop and a gizzard that can be peeled, is clean. Rabbi Elazar bar Zadok says: every bird that parts its toes is unclean.
Mishnah Meilah
Orlah and kilayim of the vineyard can combine with one another. Rabbi Shimon says: they do not combine. Cloth, sack-cloth, sack-cloth and leather, leather and matting combine with one another. Rabbi Shimon: What is the reason? Because these are all susceptible to the uncleanness caused by sitting.