Yep, like a caterpillar is a butterfly - How does a caterpillar turn into a butterfly? A guide to nature’s greatest transformation
The metamorphosis from caterpillar to butterfly is miraculous, but how does the process actually work, and what happens inside that pupa?
Richard Jones Published: October 14, 2024 at 12:26 am
A caterpillar's transformation into a butterfly has fascinated humans for generations. After all, the metamorphosis of a stubby, crawling, land-based insect into an airborne fairy is the perfect metaphor for change, improvement, escape, even life after death.
But at its core is a prosaic and very basic biological urge: the need to eat and grow in safety, then – and only then – to disperse.
The caterpillar is a veritable eating machine – a cylindrical, plant-digesting bag. During the few days or weeks that it is active, it will devour many times its own weight in whatever its chosen foodplant might be.
As in all insects, it is the larval stage that does almost all of the eating, and certainly all of the growing. The caterpillar does this quietly and secretively.
Hatchlings resemble miniature adults, with wing-buds gradually increasing until the fully winged adult size is achieved. This is called hemimetaboly, a seemingly half or partial change.
Holometaboly, a full change, is the complete – and often dramatic – metamorphosis from worm-like larvae to large-winged adults (in entomological jargon, imagos or imagines). It’s an extremely advanced mechanism, a highly sophisticated chemical suppression of developmental processes.
Though only 9 of 26 insect orders are holometabolic, this accounts for 80 per cent of all insects (butterflies, beetles, moths, flies, bees, wasps and ants are majority stakeholders). In short, this is a very successful strategy for growth and development.
Want to see the process for yourself? Rearing caterpillars is super easy and fascinating to watch, and we've got everything you need to know right here:
Caterpillars are primed to become butterflies from birth
Even in the smallest caterpillar, just hatched from the minuscule egg, bundles of cells are already primed, destined to become adult features such as antennae, wings, legs and genitalia. Called imaginal discs (being flat and round), they are prevented from growing and developing by a constant wash of a juvenile hormone.
As the larva feeds, its gut, muscles and some other internal organs grow and develop, but the imaginal discs are temporarily suppressed and remain dormant. The caterpillar behaves like a free-living, eating, growing but developmentally repressed embryo.
"Well, hell, why not? The church and magat's say life at conception, before any cells even develop as well as consciousness being there even when there's no brain impulses or mass at all. so, fuck it, lets just call a piece of skinny macaroni gristle a full functioning heart."
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