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Hawkers are the largest dragonflies, with a restless hawking flight. When at rest they hang down from branches or stems, rather than perching.
The emperor dragonfly is the largest and most impressive, with its swift, direct flight and, in the male, sky-blue colouring. The brown hawker is equally distinctive, with its ambre-tinted wings.
The southern hawker and migrant hawker are similar in appearance, the former usually seen alone and the latter in groups flying at treetop level along the woodland edge.