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It seems wild that some animals basically trade in their bodies for new ones during their lifetime, but it's actually really common – and it makes a lot of sense.

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To learn more about this topic, start your googling with these keywords:

• Metamorphosis: a biological process by which an animal physically develops including birth transformation or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure.
• Holometabolous: a type of metamorphosis (also known as "complete metamorphosis") that involves four distinct stages: egg, larva, pupa, and adult.
• Hemimetamolous: a type of metamorphosis (also known as "incomplete metamorphosis") that includes three distinct stages: the egg, nymph, and the adult stage.

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CREDITS

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Kate Yoshida | Script Writer, Narrator and Director Arcadi Garcia i Rius | Storyboard Artist Sarah Berman | Illustration, Video Editing and Animation Nathaniel Schroeder | Music

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Lizah van der Aart • Sarah Berman • Cameron Duke Arcadi Garcia i Rius • David Goldenberg • Melissa Hayes Alex Reich • Henry Reich • Peter Reich Ever Salazar • Leonardo Souza • Kate Yoshida

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REFERENCES

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Ebenman, B (1992). Evolution in Organisms that Change Their Niches during the Life Cycle. The American Naturalist 139(5): 990–1021. https://doi.org/10.1086/285370

Rolff J, Johnston PR, Reynolds S (2019). Complete metamorphosis of insects. Philos Trans R Soc Lond B Biol Sci Oct 14;374. https://doi.org/10.1098/rstb.2019.0063

Sherratt E, Vidal-García M, Anstis M, Keogh JS (2017). Adult frogs and tadpoles have different macroevolutionary patterns across the Australian continent. Nature Ecology & Evolution, 1(9): 1385–1391. https://doi.org/10.1038/s41559-017-0268-6

Ten Brink H, de Roos AM , Dieckmann U (2019) The evolutionary ecology of metamorphosis. The American Naturalist 193(5), E116-E131. https://doi.org/10.1086/701779

Truman JW (2019). The Evolution of Insect Metamorphosis, Current Biology 29(23): R1252-R1268. https://doi.org/10.1016/j.cub.2019.10.009

Truman JW, Riddiford LM (2019). The evolution of insect metamorphosis: a developmental and endocrine view. Phil. Trans. R. Soc. B37420190070. https://doi.org/10.1098/rstb.2019.0070

Truman JW, Riddiford LM (1999). The origins of insect metamorphosis. Nature, 401(6752), 447–452. https://doi.org/10.1038/46737