system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When one animal eats another animal that has a defensive mechanism such as claws or fangs, how is it that they don't cause internal damage?

I'm thinking about a fish eating a crab or a frog eating a spider. What stops the prey from using their defensive measures internally and causing damage?
gpt
Typically the animal wouldn't be eaten whole and it would be killed first. The animal would avoid eating the majority of a crabs shell or the bones and claws etc of other things unless it was sufficiently bigger. For instance a human can safely eat a sardine whole but you would want your tuna to be deboned. Venomous creatures are typically not poisonous and that is an important distinction, venom is only effective intravenously, ingesting venom is generally fairly safe. Poison works via ingestion or various other methods, so a poisonous caterpillar is going to mess you up no matter how you eat it.