香港生物多樣性博物館
HONG KONG BIODIVERSITY MUSEUM
研究 • 教育 • 保存 Research • Education • Preservation
分配：
Every continent except Antarctica
棲息地：
Freshwater habitats such as acidic bogs, ponds, lakes, and rivers
飲食：
Bloodworm, other insects larvae, tadpoles, small fish (nymph); flying insects, especially mosquitoes and true flies(adult)
全球物種數量：
3,000
香港的物種數量：
100
形態學
（如何識別它們）：
-Chunky bodies
-Compound eyes meet at the top of the head
-Hindwing is broader than forewing
-Wings held flat and away from the body when resting
圖表
你可知道 ？
Dragonflies have excellent vision and their compound eyes have nearly 24,000 ommatidia (hexagonal units of clustered photoreceptor cells). Their vision is thought to be like slow motion for humans since they can see faster than us, seeing around 200 images per second. Dragonflies can also see in 360 degrees with only one blindspot directly behind them and nearly 80% of their brain is dedicated to their sight.