English: “Among the animals” — this implies that what is found inside the animal may be eaten; from here they said that the fetus is permitted by the slaughter of its mother.
On the daf / in context: The extra word “ba-behemah” teaches that the fetus (sheliil) inside a slaughtered pure animal is permitted without separate shechitah.
Type of Learning
Derash on the extra word (Chullin / Sifrei) — inclusion of the fetus via “ba-behemah.”
What Is Learned
A viable fetus found inside a properly slaughtered pure animal is permitted for eating by virtue of the mother’s shechitah.