Quoting%20commentary for Chullin 3:6

סִימָנֵי בְהֵמָה וְחַיָּה נֶאֶמְרוּ מִן הַתּוֹרָה, וְסִימָנֵי הָעוֹף לֹא נֶאֱמָרוּ. אֲבָל אָמְרוּ חֲכָמִים, כָּל עוֹף הַדּוֹרֵס, טָמֵא. כֹּל שֶׁיֶּשׁ לוֹ אֶצְבַּע יְתֵרָה, וְזֶפֶק, וְקֻרְקְבָנוֹ נִקְלָף, טָהוֹר. רַבִּי אֱלִיעֶזֶר בַּר צָדוֹק אוֹמֵר, כָּל עוֹף הַחוֹלֵק אֶת רַגְלָיו, טָמֵא:

The signs by which the clean animals, domestic and wild, may be distinguished [from the unclean and prohibited ones] are mentioned in the Holy Law, but not those of fowl. The sages have, however, established, "That every [predaceous] bird, which strikes its talons into its prey, is of the unclean: every bird which has an additional claw, a crop, and of which the internal coat of the stomach may be readily peeled off, is of the clean species." R. Eleazar ben Zadok saith, "Every bird which [when placed on a perch] divides its toes equally, is an unclean one."

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