Overview: A New Type of Treifa
Chullin 53 introduces a new category of treifot:
damage caused by predators attacking (דריסה).
Until now, the Gemara focused on holes, internal injuries, and trauma. Here, it explains that an animal can become a treifa even without visible damage, if a predator’s attack introduces lethal internal effects (like venom).
What Is “Derisah” (Predatory Attack)?
Derisah refers to a predator clawing or tearing into another animal in a way that injects harmful substance or causes internal damage. The concern is not only the physical wound, but that the attack causes a fatal internal process.
The daf analyzes which attacks count and which do not.
Which Animals Cause Derisah?
The Gemara discusses different predators and whether their attack renders the victim a treifa:
- Cats are considered venomous → their clawing can make an animal treifa
- Weasels are not considered venomous in the same way
- Larger predators (like lions or birds of prey) can also cause derisah depending on the case
The halacha depends on:
- The type of attacker
- The size of the victim
- The nature of the attack
Not Every Scratch Counts
The Gemara limits the cases significantly:
- Only a deliberate attack counts
- Only a claw from the front leg is considered dangerous
- The attacker must be alive at the time
- Bites or accidental scratches are not treated the same way
This shows that derisah is a very specific type of injury, not just any wound.
How the Damage Happens
A key insight of the daf is how the damage takes place:
- The danger is not only when the claw enters
- Rather, the harmful effect occurs when the predator withdraws the claw
This explains why certain types of contact are considered dangerous and others are not.
Cases of Doubt
The Gemara discusses uncertain situations:
For example:
- A lion enters a group of animals
- A wound is later found
In such cases, we do not automatically assume treifa, unless there is clear evidence of a qualifying attack. [
Birds of Prey
The sugya extends the same ideas to birds:
- Certain predatory birds can render other birds treifa
- The rule depends on relative size — some attack only smaller birds, others even larger ones
Conceptual Development
Chullin 53 adds an important dimension:
- Earlier dapim: structural damage (holes, breaks)
- Here: biological/hidden damage (venom, internal effect of attack)
The animal may appear intact but still be a treifa because of what the attack caused internally.
Final Summary
Chullin 53 introduces the laws of derisah, where predator attacks can render an animal a treifa due to internal damage, even without clear physical signs. The daf carefully defines which animals, which types of attacks, and which conditions create this status, emphasizing that only specific, intentional predatory actions are included.