Common Green Darner

Adult Common Green Darners (Anax junius) reach approximately 7 to 8 centimeters in body length, with a wingspan of around 10 to 12 centimeters, making them one of the largest dragonflies in North America. They belong to the family Aeshnidae, known as darner dragonflies, which includes many large species. The distinctive green thorax and long abdomen make them easy to identify in flight.

Yes, Common Green Darners are one of the few dragonfly species known to undertake long-distance migrations, with some individuals traveling hundreds of miles between northern breeding grounds and southern overwintering areas. Research has shown that, like monarch butterflies, different generations complete different legs of the migration cycle. Not all populations migrate, however—some remain resident year-round in warmer climates.

Mature males typically have a bright green thorax and a blue abdomen, while females usually have a green thorax with a reddish-brown or grayish abdomen. However, females can sometimes develop blue coloration similar to males, particularly in certain regions. Both sexes have a distinctive bullseye-shaped marking on the forehead, just in front of the large compound eyes.

The aquatic nymphs (naiads) are aggressive predators, feeding on mosquito larvae, aquatic insects, small crustaceans, tadpoles, and even small fish. They use an extendable lower lip (labium) to snatch prey, a feature common to dragonfly nymphs. The nymphal stage can last from a few months to several years depending on conditions before they emerge as adults.