Pororo and Crong visit their friend Tongtong and find a rare magic herb. Crong then discovers a caterpillar, which they name Wriggles, and decide to take it home. As Wriggles grows, they learn it needs to eat leaves and eventually undergoes a transformation, forming a hard shell. Eddy explains that Wriggles is in its pupa stage and will emerge as a butterfly. When Wriggles finally emerges, it's a beautiful butterfly, but Pororo and friends realize it's too cold in their forest for it to survive. They decide to release Wriggles back in Tongtong's forest, where it can thrive in a warmer environment.
Here are the key facts extracted from the text:
1. Pororo and Crong go to visit Tongtong.
2. Tongtong is picking special herbs in the forest.
3. Pororo and Crong join Tongtong to pick herbs.
4. They find a rare magic herb.
5. Crong pulls out a caterpillar from the herb.
6. The caterpillar is named Wriggles.
7. Pororo and Crong take Wriggles home.
8. Wriggles is fed leaves and grows.
9. Wriggles becomes hungry and needs more leaves.
10. Pororo and Crong go back to the forest to pick more leaves for Wriggles.
11. Wriggles goes missing, but is later found in a hard shell.
12. Eddy explains that Wriggles is in its pupa stage.
13. Wriggles emerges from its shell as a butterfly.
14. Pororo and his friends take Wriggles back to Tongtong's forest, which is a warmer place for butterflies.
15. Wriggles is released into the forest, and Pororo and his friends say goodbye.