Reference for Chullin 129:9
ר"א בר' צדוק אומר
R'Eleazar son of R'Zadok says: A cord is stretched out for it, and if [when perched on it] it divides its toes evenly, two on each side, it is a clean bird, but if it places three toes on one side and one on the other, it is an Unclean bird.
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