YOU SAID:

I'm so hungry I'll eat a cow duck

INTO JAPANESE

おなかがすいたので牛のアヒルを食べます

BACK INTO ENGLISH

I'm hungry so I eat cow duck

INTO JAPANESE

お腹がすいたので牛鴨を食べます

BACK INTO ENGLISH

I'm hungry, so I'm going to eat beef duck

INTO JAPANESE

お腹が空いたのでビーフダックを食べに行きます

BACK INTO ENGLISH

I'm hungry, so I'm going to eat beef duck