Which of the following is NOT a typical Culex breeding site?

• A. Stagnant water
• B. Storm water
• C. Manmade structures
• D. Fast-flowing streams

Answer: (D)

Culex mosquitoes breed best in water that is still or polluted, where larvae can develop without being swept away. You’ll commonly find them in habitats where water collects and remains stagnant, such as pools of water that don’t flow, stormwater basins, and water that accumulates in manmade structures like containers or drainage features. Fast-flowing streams don’t provide the still conditions that Culex larvae need; the constant movement and oxygenation wash larvae away and prevent stable breeding sites. So, fast-flowing streams are not typical Culex breeding sites.