Cats make a low rumbling sound called purring. It sounds like they are happy when they get a treat or pet you. But cats do not only purr when they are pleased.
Why Do They Do It?
Purring happens because tiny muscles in their throat move very fast. These muscles pull the voice box open and shut many times each second. This creates a vibration that travels through their body.
Is It Just for Happiness?
No! Cats purr when they are sick, scared, or even giving birth. Scientists think this special hum helps them heal. The vibrations act like a gentle massage inside their bones. It might help broken bones mend faster and keep their hearts strong.