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[–] [S] 4 points 2 weeks ago

That’s how they hang out, they can also form ovals on larger surfaces. I believe some say it’s for camouflage but I can’t find anything specific on that.

Source: http://mirjam-knoernschild.org/wp-content/uploads/2012/06/Knoernschild_et_al_2009.pdf

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