Dragonflies migrate long distances

How do I get to be 80+ years old and not know basic facts about nature?  This week I learned that dragonflies migrate as far as some birds and Monarch butterflies.  I shared my summers with dragonflies up at Leech Lake in northern Minnesota, finding the nymphs and their empty shells on the shore and welcoming their emergence as mosquito-catchers.  But I didn't know they migrated.

When it’s back-to-school time, North Shore naturalists such as Joe Walewski at Wolf Ridge Environmental Learning Center in Finland, Minn., know to watch the skies for green darners and other dragonflies soaring overhead on their fall migration journey...

Like southbound birds that funnel along the North Shore to avoid Lake Superior’s open water, dragonflies also pass by Hawk Ridge Bird Observatory in Duluth — especially on sunny fair-weather days between late August and early September.

Last year, Sept. 1 was clearly a favorite day to fly as Hawk Ridge counted 57,000 dragonflies. On Thursday, they counted 35,000, said Sean McLaughlin, lead counter for Hawk Ridge...

Counters do estimates by 10s or even hundreds at a time when dragonflies are moving through quickly. Sometimes they’re dense enough to show up on radar like a rain cloud over Duluth.

At 3 inches or longer, green darner dragonflies are usually the most numerous and easy to spot, with their vivid green thoraxes and bright blue abdomens. They’ve also been the most studied. Scientists have put tiny trackers on their bodies and learned the insects can cover 70 to 90 miles a day on their way to Gulf states or as far as Panama.

More than a dozen species of dragonflies migrate, including white-faced and autumn meadowhawks, wandering gliders, black saddlebags and spot-winged gliders...

Like monarch butterflies, migrating dragonflies only travel one way. They mate and lay eggs at the end of their journeys. Eggs hatch into nymphs in both southern and northern states, overwintering in ponds and waterways until they emerge onto land with wings to follow seasonal migration routes.

You learn something every day.  Photo via Wikipedia.