Tau Emerald

Hemicordulia tau

Tau Emerald (Hemicordulia tau)
Image: Wikipedia / Wikimedia Commons, CC BY-SA, wikipedia

The tau emerald is a species of dragonfly in the family Corduliidae. The species was first described by Edmond de Sélys Longchamps in 1871. Source

Where is the Tau Emerald now?

In the last 8 weeks this insect was recorded 19 times across 2 areas (each area is a 5 degree square).

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Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.