English: “That has a split hoof” — Rabbi Yochanan said: One who slaughters an animal and finds inside it the form of a dove — it is forbidden for eating. And a teaching of the school of Rabbi Yishmael: “that has a split hoof among the animals—it you may eat” — a hoof among the animals you may eat.
On the daf / in context: Even the likeness of a clean bird found inside a slaughtered animal is forbidden; only a true animal fetus with hooves is covered by the permission.
Type of Learning
Derash on the verse (Chullin) — a bird-like form found inside an animal is forbidden.
What Is Learned
A fetus that has the form of a bird, even a clean bird, found inside a slaughtered animal is forbidden for eating.