- Some fish make sounds by vibrating an organ called the swim bladder.
- The swim bladder's main job is to control the way the fish floats.
- Some fish use sounds to attract a mate or scare away a predator.
Spark a discussion
- How do some fish use their swim bladder to make sounds?
- Why do fish make sounds?
- How do you make sounds? Does it involve vibration, too?
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