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Droves of dragonflies gather, devour mosquitoes

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Aquatic ecologist Robert DuBois says dragonflies migrated north earlier this year in order to reproduce. Now nymphs are emerging to return to the south.

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That means people are seeing dragonflies in huge numbers up and down Lake Michigan. DuBois says weather and migration patterns are both playing a role.

Heavy rains helped bring many insects, including mosquitoes. Dragonflies eat those insects , which also contributes to their growing numbers.

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