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Secrets of Metamorphosis: Why Some Creatures Transform

By: JV Chamary
Originally Published in  Discover Wildlife

Why does metamorphosis occur in some animals and not others? An evolutionary biologist explains.

The article "Secrets of Metamorphosis: Why Some Animals Transform" from BBC's Discover Wildlife explains why certain animals undergo dramatic changes while others retain the same form throughout life. Evolutionary biologist JV Chamary explores the biological and ecological advantages of metamorphosis.

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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A butterfly in each stage of its life cycle
© 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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Level 1 Reading Passage
Grades: 3-5Lexile Level: 600L - 800L
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Level 2 Reading Passage
Grades: 6-8Lexile Level: 800L-1000L
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Level 3 Reading Passage
Grades: 9-12Lexile Level: 1000L-1200L
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