Midrash for Chullin 99:32
כי סליק אשכחיה לרבי אבא בריה דר' חייא בר אבא א"ל
R'Johanan and R'Eleazar both said: We may compare defects in the lungs.
Sifrei Devarim
Abba Channan says in the name of R. Eliezer: The shesuah is a beast in itself; it has two backs and two spines.
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