This video is about two holly blue butterflies, in a ‘tug of war‘ on a Cornelian cherry leaf.
Henk Lammers from the Netherlands made this video.
Blue butterflies and ants: here.
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Dear Kitty. Some blog 
That’s a remarkable piece of film. They appear to be mating but the butterfly mating I’ve seen before is over in a few seconds.
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You may be right about them mating. There are subtle differences between male and female holly blue butterflies:
http://www.ukbutterflies.co.uk/species.php?species=argiolus
Unfortunately, I am not an expert in them.
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