New queen hornets grow bigger because they are given extra-rich food as larvae by worker hornets, which helps them develop into strong, fertile queens that can start new colonies.
Insects And Bugs - Facts for Kids

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Random Facts About Insects And Bugs For Kids
Scientists have discovered over 2,000 different species of fireflies living around the world!
It takes about 25 to 30 days for a silkworm to grow from a tiny caterpillar to being ready to spin its cocoon (silk house)!
A hornet’s compound eyes are made up of thousands of tiny hexagon-shaped units called ommatidia, which work together like a mosaic to form its vision.
Habitat & Survival
Domesticated (raised by people) silkworms live in special farms called sericulture (silk-making) farms, where the temperature (how hot or cold it is) is kept between about 23–28 °C!