Female Commas normally lay there ovum [eggs] on the edge of Nettle leaves and are fairly easy to find but, can be mistaken for a Red Admiral's ovum,  [who also lay their ovum on Nettle leaves and, sometimes on the edge of the leaf] as both are very much alike. The contents of the ovum are green when first laid. Then after about 8 days the contents turn a light greenish yellow and eventually you can see the tiny larva through the skin/membrane of the ovum at least 24 hours before the larva emerges, as the membrane/skin of the ovum is transparent. There are 2 broods.
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Comma ovum after about 8 eight days, now a light 
greenish yellow in colour | 
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Comma ovum after 12 days, the tiny larva  is quite visible 
through the transparent membrane/skin of the ovum | 
This stage can last anywhere between about 12-21 days depending on the weather conditions, hot, cold etc.
On the 13th day, this particular larva emerged, [the time scale for emerging larva does vary].
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| A newly emerged 1st instar larva | 
Once the larva have emerged they make their way to the back of the Nettle leaf, where they eat and rest-up,  right up to the stage of the 3rd instar larva.
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| 2nd instar Comma larva on the back of a Nettle leaf | 
Once they reach the 4th and 5th instar larva they become more exposed.
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| Final instar Comma larva | 
The larval stage lasts about 3 weeks, [but does vary in both broods] and there are 5 instars  [4 moults] with the 1st brood in the Spring, and 4 instars [3 moults] with the 2nd brood in the summer. When the final instar larva is ready to pupate it will find a suitable stem, twig etc and, make a Cremaster which it will attach itself to with a number of tiny hooks at the bottom of it's abdomen, hanging up-side down.
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|  Final instar Comma larva ready for pupation | 
This particular stage lasted 10 days, but the weather was extremely warm for this particular pupa, and the period of pupation can last longer.
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| Comma pupa, the butterfly emerged after 10 days, but this does vary | 
When the butterfly eventually emerges it can take a couple of hours before he/she to completely dry out and, be able to fly.
The 1st brood are most likely to produce the Aberration Hutchinsoni which normally emerge late June, early July.
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| Comma, female ab. Hutchinsoni | 
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|  Comma showing the upper side of it' wings | 
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| Comma showing the undersides of it's wings |