Midrash for Chullin 126:41
גלוי וידוע לפני מי שאמר והיה העולם שעופות טהורין מרובין על הטמאין לפיכך מנה הכתוב בטמאין
Our Rabbis taught: One may buy eggs from gentiles in any place and need have no fear lest they are of birds that were nebelah or trefah.
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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