Common Blue

wonderful photography!!

Beautiful photo :)))

Polyommatus icarus! http://www.danske-natur.dk/icarus.htm Yes, I am a professional, but not on Project Noah! I just have seen millions of critters the last few years, I think I still have good eyes and a good memory and I am rather quick with searching. That's all, I am not an expert!

I don't know if this will help but I found this site. http://www.danske-natur.dk/indexsyv.html

In my modest eyes, Plebejus optilete has more dark/grey margins compared to yours and Icarus. Range might be OK, but Roskilde seems for me not really be marshy and higher level altitude matching.

@Jellis, thanks :) That's a great spotting! I'll try not to despair of my location, haha, and will be further encouraged to travel more! @FaredinAliyevski, that is a beautiful beetle, although I don't know much about it. I never finished my PhD because I was anxious to get to work. After mosquitoes were no longer a hot topic, I switched to biochemistry and molecular biology (DNA repair proteins important in cancer) as a profession. Good luck in Paris, my favorite city! The internal body clock of drosophila and the negative feedback loop of their molecular clock is so fascinating!

Christine, sometimes you can be amazed. I didn't think I could see much and last month I took a picture of a small butterfly not knowing it turned out to be the smallest butterfly in the world. Keep looking, you'll find more then you thought you would.

Yes! I love seeing all the amazing and diverse spottings coming from those areas! Hopefully it will help conservation efforts! I have a master's degree in entomology (mosquitoes were my specialty), and am in awe of all the insect spottings posted on Project Noah that I have never even heard of!

bayucca and FaredinAliyevski are very lucky to live in areas of the world with such enormous diversity! I live in semi-urban Connecticut, where I mostly just see ants and flies with a few butterflies here and there. Haha!

It is even hard to get close, harder to tell them what you would like that they should do and hardest to get a sharp picture! That's butterfly life, you should not have it better in Denmark, than me in Switzerland...;-))!

Do not work too hard! I think it is Polyommatus icarus, but I am sceptic if it is serious enough to take that ID with the knowledge about the very similar open wing shots. Any other candidates besides Icarus and Thersites I already have kicked out... What do think? Any other picture?

Love this! Great addition to the Great Nature Project!

Lovely blue.. Beautiful..

Lycaenidae, Polyommatinae, Polyommatus sp., it is either Polyommatus icarus or Polyommatus thersites. I tend to Common Blue, Polyommatus icarus, but without a ventral view we can't be 100% sure. The range for Thersites might be a little far away in Denmark. But there are many reports from Germany.

Look under Lycaenidae Polyommatinae and check them. Some are coppers, some are blues

This might help http://www.leps.it/indexjs.htm?SpeciesPages/MaculAlcon.htm

So far the only Blue I see listed for Denmark (and don't hold me to it) is the Alcon Blue (Maculinea Alcon)

This could also be a Common Blue. I hope you get a correct ID! Beautiful butterfly, whatever it is!

Stunning! Could be Idas Blue (Plebejus idas) or Silver-studded blue (Plebejus argus). I think they are quite similar, except for a foreleg spine.