Jason Daley: The Dragonfly Migration

Smithsonian Magazine:

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The green darner dragonfly, Anax junius, embarks on a rigorous, multi-generational migratory relay race up and down North America every year that largely goes unnoticed, according to a new study published in the journal Biology Letters.

Dragonfly experts knew that the common emerald green and blue insects migrated, but tracking the jet-setting three-inch-long insect is tricky. The slender insects are too small for radio trackers and don’t travel in easy-to-spot swarms like monarchs or birds. To bring the details of the dragonfly’s journey to light, researchers consulted 21 years of data collected by citizen scientists and analyzed more than 800 green darner wing samples collected over the last 140 years from museums, reports Susan Milius at Science News.