system
Given the following post, respond as if you're commenting on Reddit:
human
I know Blue Whales primary diet is krill because of their teeth, but if a larger fish ended up in their mouth would they be able to eat it?
gpt
Blue whales have baleen, not teeth. They work like this:  
  
The whale aims for a swarm of krill, opens his mouth wide while turning on its side, then closes it. Folds under the jaw allow a huge amount of water being trapped there. Then the whale squeezes out all the water through the baleen with the aid of its tongue.  
Everything too large to slip through the baleen remains in the mouth and gets swallowed in a large ball.  
The only way to not be swallowed is by swimming away fast enough. Some fish make it, some don't.