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Common Green Darner (Anax junius)

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description Common Green Darner (Anax junius) Overview

The Common Green Darner (*Anax junius*) is a sizable dragonfly found throughout North America. It’s recognized by its impressive size and remarkable annual migrations, often traveling long distances. These dragonflies are particularly noticeable in early spring when they emerge. They are of interest to naturalists studying insect migration patterns and those observing aquatic ecosystems.

help Common Green Darner (Anax junius) FAQ

Do Common Green Darners migrate, and how far do they travel?

Yes, the Common Green Darner (Anax junius) is one of the few dragonfly species known to undertake long-distance seasonal migrations across North America, with some individuals traveling hundreds of miles. These migrations follow patterns similar to those of monarch butterflies, though not all populations migrate.

How can you identify a Common Green Darner?

The Common Green Darner is a large dragonfly with a distinctive bright green thorax and a long blue abdomen in mature males (brownish in females). They can reach about 3 inches (7–8 cm) in body length with a wingspan of over 4 inches, making them one of the largest common dragonflies in North America.

When do Common Green Darners first appear in spring?

Common Green Darners are among the first dragonflies to appear in spring, often arriving in northern areas of North America as early as March or April. These early arrivals are typically migrants moving northward from southern overwintering grounds.

What is the life cycle of the Common Green Darner?

The species has a complex life cycle with aquatic nymphs that live in ponds and marshes before emerging as winged adults. Some populations produce multiple generations per year, with one generation migrating south in fall and another migrating north in spring.

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