Familiar Bluets

The trailsides are teeming with bluets this year. I don’t know if it’s a bumper year, or if I’m just noticing them now. The males are striped in a vivid blue:
Bluet (Enallagma sp.), Atwood Prairie
and the females in subtler green and tan shades:
Bluet (Enallagma sp.), female, Gardner Marsh, UW Arboretum
and both are spectacular at sunset:
Bluet (Enallagma sp.) at sunset
They are damselflies, which – I finally learn – are distinguished from dragonflies by folding their wings along their back when they rest; dragonflies leave them outspread.

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