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I think you mean the Oak Eggar.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Thanks, I assume this is not the northern subgroup 400 miles out of range but the one commonly found more widely. But can anyone explain why there is so much colour variation in this species? Is it just males and females?
Its an Oak Eggar which came more apparnet when I looked at your location
Sexual dimorphism is one way that specimens vary for example the bright Male Orange Tip Butterfly versus the Plain White Female.
However evolution is all around us , commonly in subtle species changes known as forms potentially adapted to local environments and climates . Eg Melanic forms of Ladybirds and Froghoppers
With the reproductive cycles of this species we see variation based on Temp and latitude
As to this species
Red Brown Specimens are male with female being paler
Moths are like people there may be variations some to adapt to local environments Some more profound as in the Peppered Moth as a result of industrial pollution with darker melanic forms evolving
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