Midrash for Chullin 126:53
ת"ש דא"ר יוחנן
For since he (R. Abbahu) says that the ra'ah is identical with the ayyah, and in the conclusion he holds that all four - ayyah, dayyah, ra'ah and da'ah - are different names of one and the same bird, it is evident that according to him there are not twenty-four birds enumerated in the Torah. The argument in the Gemara at the outset presupposes the acceptance by R. Abbahu of R. Hisda's view, but the conclusion shows that he cannot agree with it.
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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