Reference for Chullin 129:15

קולט ואוכל קאמרי

For it was taught: R'Eliezer said: Not for nothing did the zarzir follow the raven but because it is of its kind!<span class="x" onmousemove="('comment',' Species associate with species, and according to R. Eliezer the zarzir (the starling) is unclean because it is found always in the company of ravens.');">⁸</span>

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