Midrash for Chullin 126:3
מין ראה ודאה אחת היא
But for all that there are still twenty-five?
Sifrei Devarim
And we are taught that the unclean beasts (and animals) are more numerous than the clean ones; for in all places Scripture specifies the lesser, viz. (Devarim, Ibid.) "This is the beast that you may eat … (5) the hart, the gazelle, and the fallow deer."
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