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Why Do Some Animals Glow? The Amazing Science of Bioluminescence

Originally Published in  Discover Wildlife

Many animals light up in the dark using a process called bioluminescence. From glowing worms to flashing fungi, discover how and why nature puts on such a brilliant light show.

The article "Why Do Some Animals Glow? The Amazing Science of Bioluminescence" from BBC's Discover Wildlife explains how animals like glow-worms, squid, and fireflies produce light using special chemicals. It explores the role of luciferins and luciferase, the different colors of glow, and how creatures use this glow for communication, hunting, or self-defense.

Student Article Info

BBC's Discover Wildlife brings you closer to nature with expert advice, conservation news, the best nature writing and stunning wildlife photography. Learn more about subscriptions here.

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An image of a fire fly with glowing abdomen
© Getty

Most passages are available in three different versions: Level 1 (Grade 3-5), Level 2 (Grade 6-8), and Level 3 (Grade 9-12). Some more complex texts are available only in Level 2 and Level 3. Use the versions that are most appropriate for the students in your class.

Note: The BBC Learning Hub Editorial Team made use of AI tools to create multiple versions of this article, each tailored to different student reading levels. Every version undergoes a thorough review by our BBC Learning editors to ensure accuracy, quality, and appropriateness.

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Grades: 3-5Lexile Level: 400-600L
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Level 2 Reading Passage
Grades: 6-8Lexile Level: 700L-900L
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Level 3 Reading Passage
Grades: 9-12Lexile Level: 900-1200L
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