Silkworms breathe through tiny holes along their sides called spiracles (breathing holes), which connect to tubes that carry air deep inside their bodies!
Insects And Bugs - Facts for Kids

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Random Facts About Insects And Bugs For Kids
Bees release a special scent when they’re alarmed to warn other bees of danger!
Honeybees can detect electric fields produced by flowers!
Modern Uses
Scientists use silkworms to study genetics because they grow quickly and are easy to raise!
The smallest bee in the world is the Perdita minima, which is smaller than a grain of rice!