Related for Keritot 34:25
זו ואין צריך למימר זו
Said Rab Judah in the name of Rab: If there were before a person two pieces, one of permitted fat and the other of heleb, and he ate of one of them and does not know of which of them he ate, he is liable; [if there was] one piece [before him] about which [there was] a doubt whether it was permitted fat or heleb, and he ate of it, he is exempt.
Tosefta Bikkurim
A k'vi (see Bikkurim 2:8) -- how is it like a wild animal? Its blood requires covering like a wild animal. Rabbi Eliezer says, they are liable to bring a variable guilt-offering for [partaking in] their [forbidden] fats. How is it like both a wild animal and a domesticated animal? One who flays (המפשיט not מפסיד, see GR"A) it, [the laws regarding whether its hide is] connected [to its flesh is] like wild animals and domesticated animals (see Tos. Chullin 8:6). And [the laws of] the sciatic nerve apply to it, like they do to wild animals and domesticated animals. If he said, "Behold, I will become a nazirite if [the k'vi] is [neither] a wild animal or a domesticated animal," behold, he has become a nazirite. Rabbi Yosei says, a k'vi is a unique creation unto itself, and the Sages were unable to render a decision about it, if it it is a wild animal or a domesticated animal.
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