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Over 60% of Japan's wetlands were lost in the 20th century, so its dragonflies now depend largely on rice fields, ponds, and creeks. Dragonflies feed on pest insects in rice, acting as a natural pest control. [91] [92] Dragonflies are steadily declining in Africa, and represent a conservation priority. [93]
The green darner is a large dragonfly; males grow to 76 mm (3.0 in) in length with a wingspan up to 80 mm (3.1 in). [ 9 ] [ 10 ] Females oviposit in aquatic vegetation, eggs laid beneath the water surface.
The larvae develop within 38 to 65 days, [17] which allows this migrant dragonfly to reproduce in temporary waters or even in swimming pools. [18] However, the larvae seem to be very sensitive to temperature. [19] The life expectancy is not known and because of their high mobility it is almost impossible to determine.
The eggs hatch in 4 or 5 weeks and the larvae take one to two years to develop. The larvae live in the silt and detritus at the bottom of the pond, lying buried in mud with just the head and eyes showing. After emergence the adults move away from water and undergo a period of maturation which lasts 10 to 14 days.
Adults don't live long comparatively, perhaps a few weeks or months, and for this reason, Serafice says, dragonflies may also serve as a reminder to be present, enjoy life to the fullest and live ...
It is a medium-sized dragonfly with a wingspan of 60-85mm. Adults are greyish to greenish yellow with black and pale markings and green eyes. Its abdomen is greenish-yellow, marked with black. [8] It is very similar to Orthetrum serapia in appearance, with both species appearing in northern Australia.
Somatochlora sahlbergi adults are medium-sized (about 4.8 cm (1.9 in) long [7]) dragonflies with dark, metallic green bodies and transparent wings, much like other species of Somatochlora. [8] Unlike some other species in the genus, there is very little paler yellow marking on the thorax and abdomen. [7] The body is covered in a dense coat of ...
As the global median life expectancy reaches 72 years, Earth's population is on the verge of becoming the oldest it has ever been. By 2030, 1 in 6 people will be over 60 years old, marking a ...