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Tumah belu'a - something tamei swallowed does not transmit tumah; and if it is tahor it cannot become tamei.

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At what stage, of birth, does an animal bechor become Kodesh?

The sources for the machlokes if a dead fetus of a non kosher animal transmits tumah while inside it's mother.

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The derasha we learn out that the fetus is covered by its mother's shechita.

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If an animal fetus sticks out its leg and returns it, doe the shechita of the mother cover the leg?

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Which bodies of water can a creature grow in and be kosher without fins and scales.

When is a worm that grew in an animal fruit or vegetable mutar?

In this daf:

Relying on an akum to buy eggs.

Blood spots.

The source a non kosher bird's egg is assur de'oraysa.

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Identifying kosher birds.

How many non kosher birds are there?

Relying on a mesorah to eat birds.

In this daf:

Continuing the discussion of determining which birds you can eat.

In this daf:

the signs of a kosher bird.

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The questions Cesar asked R' Yehoshua ben Chananya regarding seeing Hashem.

Ideas on ma'aseh bereishis (plants making a kal vachomer, the shrinking of the moon...).

Pesukim that seem unnecessary.