How do I rear a caterpillar?<\/a><\/p>\n\u00a9 Science Photo Library\/Getty<\/em><\/p>\n <\/p><\/div>
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Caterpillars are primed to become butterflies from birth<\/h2>\n 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.<\/p>\n
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.<\/p>\n
When it reaches a critical size,\u00a0a burst of moulting hormone, ecdysone, is released. It will shed its skin several times in response to ecdysone, each time forming a new instar (stage), but juvenile hormone keeps it a caterpillar, preventing onward development until,\u00a0as it nears full size, concentrations of the latter hormone decline.<\/p>\n
Comma butterfly caterpillar. \u00a9 Jasius\/Getty<\/em><\/span><\/figcaption><\/div>\nCaterpillar metamorphosis \u2013 from caterpillar to butterfly<\/h2>\n In the fifth and final caterpillar instar, the imaginal discs have already begun to emerge from their enforced dormancy and started to grow. Juvenile hormone now falls below a threshold and the next ecdysone surge stimulates the change into\u00a0a chrysalis.<\/p>\n
The flattened imaginal discs now start to develop unhindered. Each folds into a concave dome, then a sock shape; the centre of each disc is destined to become an extremity \u2013 the tip of a leg or the end of a wing.<\/p>\n
Even the pupae of some butterflies (like this Blanchard\u2019s ghost butterfly chrysalis) can be beautiful. \u00a9 Paul Starosta\/Getty<\/em><\/span><\/figcaption><\/div>\nThe bulk of the caterpillar\u2019s pudgy mass is recycled into the adult features that are meshing together inside the tough shell of the chrysalis. The interior is, at this stage, mostly a nutrient soup, feeding the embryonic imaginal discs as they complete their delayed development.<\/p>\n
The last burst of ecdysone occurs amidst almost zero juvenile hormone \u2013 and stimulates the emergence of the adult butterfly to mate, disperse and lay its eggs.<\/p>\n
The entire process of a caterpillar turning into a butterfly is driven by hormonal changes. \u00a9 Ujang Achmad\/EyeEm\/Getty<\/em><\/span><\/figcaption><\/div>\nHow a caterpillar\u2019s transformation is controlled<\/h2>\nThere are usually\u00a0six metamorphic transformations in the butterfly growth path, each stimulated by\u00a0a burst of moulting hormone ecdysone (A) from the prothoracic gland.<\/li>\n Juvenile hormone (JH), secreted by the corpus allatum gland, slows progress towards adulthood: while levels of JH are high, it keeps the caterpillar a larva.<\/li>\n However, JH secretion slows over time; only when it falls below a critical level (B) does\u00a0a moult result in a chrysalis and pupation.<\/li>\n Now comes a massive redistribution of nutrients, and adult features can finally develop. With JH levels virtually down to zero, the final moult (C) is into an adult.<\/li>\n<\/ul> This monarch butterfly chrysalis is very close to completion, with the adult butterfly\u2019s wings visible inside. \u00a9 Leonard Gertz\/Getty<\/em><\/span><\/figcaption><\/div>\nDo all caterpillars turn into butterflies?<\/h2>\n No, some caterpillars turn into moths. If you see a caterpillar, it will definitely change into a butterfly or a moth and it can\u2019t become anything else, but there\u2019s no reliable way to know which it will become just by looking at it.<\/p>\n
The only way to know for sure is if you can identify the species of butterfly or moth that the caterpillar will become, as they tend to be distinctive and fairly easy to identify.<\/p>\n
If you couldn\u2019t identify this rusty tussock moth caterpillar, there would be no way to know whether it would become a moth or a butterfly. \u00a9 mikroman6\/Getty<\/em><\/span><\/figcaption><\/div><\/body><\/html>\nBy Richard Jones Published: Friday, 29 April 2022 at 12:00 am A caterpillar\u2019s 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 […]<\/p>\n","protected":false},"author":24,"featured_media":16181,"template":"","categories":[1],"acf":{"readingTimeMinutes":"6"},"uagb_featured_image_src":{"full":["https:\/\/c01.purpledshub.com\/uploads\/sites\/44\/2022\/04\/how-does-a-caterpillar-turn-into-a-butterfly-scaled.jpg",2560,1707,false],"thumbnail":["https:\/\/c01.purpledshub.com\/uploads\/sites\/44\/2022\/04\/how-does-a-caterpillar-turn-into-a-butterfly-150x150.jpg",150,150,true],"medium":["https:\/\/c01.purpledshub.com\/uploads\/sites\/44\/2022\/04\/how-does-a-caterpillar-turn-into-a-butterfly-300x200.jpg",300,200,true],"medium_large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/44\/2022\/04\/how-does-a-caterpillar-turn-into-a-butterfly-768x512.jpg",768,512,true],"large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/44\/2022\/04\/how-does-a-caterpillar-turn-into-a-butterfly-1024x683.jpg",800,534,true],"1536x1536":["https:\/\/c01.purpledshub.com\/uploads\/sites\/44\/2022\/04\/how-does-a-caterpillar-turn-into-a-butterfly-1536x1024.jpg",1536,1024,true],"2048x2048":["https:\/\/c01.purpledshub.com\/uploads\/sites\/44\/2022\/04\/how-does-a-caterpillar-turn-into-a-butterfly-2048x1365.jpg",2048,1365,true]},"uagb_author_info":{"display_name":"importmanagerhub@sprylab.com","author_link":"https:\/\/c01.purpledshub.com\/bbcwildlife\/author\/importmanagerhubsprylab-com\/"},"uagb_comment_info":0,"uagb_excerpt":"By Richard Jones Published: Friday, 29 April 2022 at 12:00 am A caterpillar\u2019s 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…","_links":{"self":[{"href":"https:\/\/c01.purpledshub.com\/bbcwildlife\/wp-json\/wp\/v2\/rss_feed\/16180"}],"collection":[{"href":"https:\/\/c01.purpledshub.com\/bbcwildlife\/wp-json\/wp\/v2\/rss_feed"}],"about":[{"href":"https:\/\/c01.purpledshub.com\/bbcwildlife\/wp-json\/wp\/v2\/types\/rss_feed"}],"author":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcwildlife\/wp-json\/wp\/v2\/users\/24"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcwildlife\/wp-json\/wp\/v2\/media\/16181"}],"wp:attachment":[{"href":"https:\/\/c01.purpledshub.com\/bbcwildlife\/wp-json\/wp\/v2\/media?parent=16180"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcwildlife\/wp-json\/wp\/v2\/categories?post=16180"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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