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Illustration of Animal Life Cycles

Animal Life Cycles

The series of changes an animal undergoes from birth through growth, reproduction, and death.

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Reads at Grades K-2 Listens at K–3

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The story

The Amazing Story of Animal Life Cycles

Have you ever seen a wiggly caterpillar munching on a leaf and wondered what it would become. Or watched a tiny tadpole swimming in a pond and imagined it hopping on land. That’s me at work. I am the secret recipe that turns a baby animal into a grown-up. I am a circle of change, a pattern for growing. Before anyone knew my name, they saw me making a fluffy chick hatch from an egg and a tiny kitten grow into a big cat. I am the amazing, turning, growing story inside every creature. I am Animal Life Cycles.

For a very long time, people saw me but didn't quite understand. Thousands of years ago, around 3000 BCE, people in ancient Egypt watched scarab beetles appear as if by magic from little balls of dirt, and they thought I was a symbol of new life. Later, in ancient Greece, a very curious man named Aristotle, who lived around 350 BCE, spent hours watching creatures. He was one of the first people to write down my secrets, describing how a fuzzy caterpillar wraps itself in a cozy case before becoming a beautiful butterfly. But even then, some people thought caterpillars and butterflies were two different animals. It took a brave artist and scientist named Maria Sibylla Merian to show everyone the truth. In the year 1699, she sailed across the ocean to study insects. She painted beautiful, careful pictures of me in action, showing every single step of my journey. Her paintings proved that the caterpillar and the butterfly were the same creature, just at different parts of their story.

Today, knowing about me is more important than ever. I help scientists understand how to protect animals, like sea turtles who need to find safe beaches to lay their eggs. I help farmers know when to plant their seeds and when to look out for hungry insects. And I help you understand the beautiful world around you. Every time you see a bird build a nest, a puppy grow bigger, or a ladybug emerge with new spots, you’re seeing my wonderful, endless story. I am a reminder that everything is connected and that change is a natural, amazing part of life. What new life cycles can you discover today.

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About

The series of changes an animal undergoes from birth through growth, reproduction, and death. This fundamental biological concept explains how species propagate and often involves processes like how many animals change form during their life cycles.

Observed 350 BCE
Studied 1668 CE
Documented 1705 CE

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Who was the man from ancient Greece who wrote down his observations about animal life cycles?

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Animal Life Cycles
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