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The migrant hawker (Aeshna mixta) is one of the smaller species of hawker dragonflies. It can be found away from water but for breeding it prefers still or slow-flowing water and can tolerate brackish sites. The flight period is from July to the end of October. A. mixta occurs in North Africa, southern and central Europe to the Baltic region.
The giant hawker (Tetracanthagyna plagiata) or the gigantic riverhawker, is a species of dragonfly in the family Aeshnidae. It is found throughout Sundaland, having been recorded on Thailand, Peninsular Malaysia, Singapore, Sumatra, and Borneo. It is the type species for the genus Tetracanthagyna.
The common hawker, [2] moorland hawker [1] or sedge darner [1] (Aeshna juncea) is one of the larger species of hawker dragonflies. It is native to Palearctic (from Ireland to Japan) and northern North America. The flight period is from June to early October. It is 74 millimetres (2.9 in) long with a brown body.
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Its common name in English is green-eyed hawker. In the United Kingdom it is a localised species, and is called the Norfolk hawker . Aeshna isoceles is brown, with green eyes, clear wings, and a yellow triangular mark on the second abdominal segment which gave rise to its scientific name .
Dragonfly vision is thought to be like slow motion for humans. Dragonflies see faster than humans do; they see around 200 images per second. [80] A dragonfly can see in 360 degrees, and nearly 80 per cent of the insect's brain is dedicated to its sight. [81]
The species is one of the most common and most widespread dragonflies in Europe. The range in the Western Palearctic covers a large part of Europe, to Scotland and southern Scandinavia in the north and to Italy (without the southwest) and the northern Balkans in the south); the eastern boundary is formed by the Urals and the western by Ireland.
Anax imperator Leach, 1815 – emperor dragonfly, [13] blue emperor [14] Anax indicus Lieftinck, 1942 – elephant emperor [15] Anax junius (Drury, 1773) – common green darner [6] Anax longipes Hagen, 1861 – comet darner [6] Anax maclachlani Förster, 1898; Anax mandrakae Gauthier, 1988; Anax nigrofasciatus Oguma, 1915 – blue-spotted ...