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Archive for September 5, 2017

Shadow Darners Laying Eggs

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The dragonfly family Aeshnidae consists of strong-flying dragonflies called darners, some of which are over three inches in length.  The majority of darners reach the peak of their population in August and early September.  Male Shadow Darners (Aeshna umbrosa) can be seen patrolling breeding sites a few feet over the water’s surface, searching for females and driving off competing males. Females can be observed repeatedly landing at the base of cattails, inserting their sharp-edged ovipositors and slicing open leaves, where they then deposit their eggs.  If you look at the bottom third of cattails at this time of year, near the water’s surface, you will find tiny, tan, vertical slits where dragonfly egg-laying has taken place. (Photo:  female Shadow Darner laying eggs)

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