Slide 1
One insect has different bodies
A butterfly begins as a caterpillar before becoming a winged adult. Complete metamorphosis includes egg, larva, pupa and adult stages.
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Beetles, flies and several other groups also follow this pattern. The familiar butterfly is an example of a widespread developmental strategy rather than a unique transformation.
Slide 2
A larva concentrates on growth
A larva feeds and grows through successive moults. Its shape and mouthparts can suit a different task from the adult's.
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A leaf-eating caterpillar and a nectar-feeding butterfly use different resources. This separation can reduce competition between stages while making the species dependent on more than one food source.
Slide 3
A pupa transforms actively
During the pupal stage, tissues are reorganized and adult structures develop. A still outer surface does not mean nothing is happening inside.
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Transformation uses resources accumulated earlier. Failure to obtain suitable larval food can affect adult emergence even when flowers for adult feeding are abundant nearby.
Slide 4
Not every insect has a pupa
Grasshoppers undergo incomplete metamorphosis. Their young, called nymphs, resemble adults more closely and develop through a series of moults.
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These pathways use different stages, not different levels of evolutionary completeness. Incomplete names a developmental pattern and does not mean a grasshopper is an unfinished butterfly.
Slide 5
Conservation follows the whole cycle
An insect needs suitable conditions for every life stage. Protecting adult feeding sites alone may leave its breeding requirements unmet.
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Butterfly habitat can require particular caterpillar host plants as well as nectar. Thinking across the life cycle explains why an attractive flower patch does not support every butterfly species.
Sources
- Metamorphosis in Arthropods
American Museum of Natural History
- How to attract butterflies to your garden
Natural History Museum