After closely tracking hundreds of mosquitoes swarming around a subject and analyzing 20 million data points, researchers at the Georgia Institute of Technology and the Massachusetts Institute of Technology developed a mathematical model that predicts how female mosquitoes fly toward humans in search of food.
This study provides the first detailed visualization of mosquito flight behavior, providing measurable data that may improve trapping and control methods. Mosquitoes are not only irritating, but they also spread dangerous diseases such as malaria, yellow fever, and Zika, which together kill more than 700,000 people each year.
The team has also launched an interactive public website where users can explore the movements and behavior of mosquitoes.
Tracking flying mosquitoes using 3D imaging
To understand how mosquitoes move, scientists used a 3D infrared camera to observe how the insects use visual signals and carbon dioxide to move around objects. They then put a person in a controlled room, changed the color of their clothes, and recorded how mosquitoes flew around them.
The survey results are scientific progressfocused on women Aedes aegypti Mosquitoes (also called yellow fever mosquitoes). It is a common species in the southeastern United States, California, and many areas around the world.
Mosquitoes follow signals, not each other
Data shows that mosquitoes don’t come together to chase each other. Instead, each insect responds independently to environmental cues, but ends up congregating in the same location at the same time.
“It’s like a crowded bar,” says David Hu, a professor in Georgia Tech’s George W. Woodruff School of Mechanical Engineering and Biological Sciences. “The customers aren’t there because they followed each other into the bar. They’re attracted to the same cues: the drinks, the music, the atmosphere. The same goes for mosquitoes. Mosquitoes don’t follow leaders, they follow cues, and they just happen to end up in the same place as other mosquitoes. They’re good copies of each other.”
A powerful combination of visual cues and CO2
The researchers conducted three experiments in which they adjusted visual targets and carbon dioxide levels. In the first tests, the black sphere attracted mosquitoes, but only when the mosquitoes were already flying towards it. After reaching the object, they usually did not stay there and moved on quickly.
When the researchers replaced the black object with a white object and added carbon dioxide, the mosquitoes were able to locate the source, but only at close range. Hu observed the insects pause for a moment, as if doing a “double look,” before congregating nearby.
The effect was strongest when both the black object and CO2 were present simultaneously. Mosquitoes swarmed the area, stayed and tried to feed.
“Previous research has shown that visual cues and carbon dioxide attract mosquitoes, but we didn’t know how those cues were combined to decide where to fly,” said Christopher Zuo, who conducted the research as a master’s student at Georgia Tech. “They’re like little robots. We had to understand their rules.”
Human experiments reveal where mosquitoes target
After realizing the importance of static visual cues, Zuo tested it himself. He entered the chamber wearing a variety of clothing, including all black, all white, and mixed clothing.
Standing with his arms outstretched, he allowed dozens of mosquitoes to fly around him while a camera recorded their path. The data was later analyzed at MIT to identify the rules most likely to guide their movements.
The mosquito acted as if Zuo was just another object. The largest masses form around the head and shoulders, which are the most commonly targeted areas for this species.
Mr. Luo wore a long-sleeved sweatshirt, pants, and a head covering inside the chamber. He said he didn’t get bitten often.
Interactive model showing mosquito behavior
The team’s interactive model and website show how mosquitoes change direction, accelerate, and decelerate based on visual signals and CO2. Users can switch between different conditions such as color, carbon dioxide, both, or neither, and see how up to 20 mosquitoes respond. The platform also allows users to upload custom images as targets.
New insights could improve mosquito control
The researchers believe their findings could lead to more effective pest control strategies.
“One tactic is to use suction traps that rely on stable cues, such as continuous CO2 emissions or a constant light source, to attract mosquitoes,” Zuo said. “Our study suggests that it may be better to use them intermittently, activating suction at intervals, because mosquitoes are less likely to stick around the target if both cues are not used at the same time.”
Zuo and Hu collaborated on their Ph.D.s in mechanical engineering. Candidate Kim Soo Hwan. Other co-authors include Chenyi Fei and Alexander Cohen of MIT and Ring Carde of the University of California, Riverside.
