Yellow Fever Mosquito

The yellow fever mosquito, Aedes aegypti, originated in the forests of Africa but has become one of the most widespread and closely studied mosquito species due to its strong association with human settlements throughout the tropics and subtropics. It thrives wherever people live, breeding almost exclusively in small containers of standing water rather than natural wetlands.

This species is notable for its close relationship with humans, often resting indoors or in shaded areas near homes and preferring to feed on people over other available hosts. Its striking lyre-shaped white marking on the thorax makes it identifiable among the many mosquito species found in warm climates.

Because of its dependence on small, human-created water sources such as buckets, discarded containers, and storage jars, populations of this mosquito often track closely with patterns of urban development and water storage practices.

• Dark brown to black body, 4-7 mm long
• Distinctive lyre- or violin-shaped pair of curved white stripes on top of the thorax
• White banding on the legs
• Lookalikes: the Asian tiger mosquito has a single straight white stripe down the center of the thorax rather than the curved, paired lyre pattern

Found throughout tropical and subtropical regions worldwide, the yellow fever mosquito is strongly associated with human settlements. It breeds almost exclusively in small artificial or natural containers holding clean standing water, including buckets, flowerpot saucers, discarded tires, and water storage jars found around homes.

This mosquito bites primarily during daylight hours, especially in the early morning and late afternoon, and shows a strong preference for feeding on humans over other animals, often taking several small blood meals from different people during one reproductive cycle. Adults typically rest indoors or in shaded areas close to human dwellings. Larvae are filter feeders, consuming microorganisms present in their small container habitats.

Females lay eggs individually just above the waterline inside containers, and these eggs can withstand drying for extended periods, hatching once submerged again by rain or refilling. Larvae develop through four instars in the water, feeding on organic particles and microbes, then pupate in the same container. Adults typically emerge about eight to ten days after eggs are laid under warm conditions, with many overlapping generations produced annually in tropical climates.