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This nice neon shining and yellow larva was about 30 mm on a young birch.
Any suggestion are appreciated.

Photo from Mjällomslandet, Ångermanland, Sweden 62.53N 17.45 E 5 may 2010

Thanks for your help in advance

Regards

Kurt Holmqvist

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Does blue comes from wrong white ballance or is it realy blue colored ?

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Larva was shining neon blue as in the picture.

White balance was on daylight and photo with flash in RAW

Kurt Holmqvist

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And from side

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mybe something close or equal to
Malacosoma americanum

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Thanks for your attempt Bubikol

Swedish Malacosoma larvas looks quite different
Kurt Holmqvist