Culex is a genus of mosquitoes known for its role in transmitting various diseases. These insects are commonly found in tropical and temperate regions around the world. Culex mosquitoes are often associated with the spread of illnesses such as West Nile virus and filariasis, which can affect both humans and animals. Culex mosquitoes typically breed in stagnant water, such as ponds, marshes, and containers. They are most active during dusk and dawn, feeding on the blood of birds and mammals. Understanding their behavior and habitat is crucial for controlling their populations and reducing the risk of disease transmission.