Reference for Chullin 121:3

אמר אביי

which implies, as the turtle dove has an extra toe and a crop, its gizzard can be peeled, it does not seize prey and eat it, and is clean, so all that have the like characteristics are clean!<span class="x" onmousemove="('comment',' The propositions in this Baraitha are inferred from the interpretation of words in the Torah and are regarded as implicit in the Torah, thus contradicting our Mishnah which declares that the characteristics of birds are not stated in the Torah.');">³</span>

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