There, lab-reared mosquitoes—for instance, males that have been sterilized—mix with wild mosquitoes and hinder the population’s ability to reproduce or transmit disease to humans. But, getting those mosquitoes from the lab into the wild presents logistical challenges, such as how the mosquitoes should be packed for transport. A project led by researchers at New Mexico State University sought to answer how tightly male Aedes aegypti mosquitoes could be packed together.