Sweat Bee (<em>Halictus ligatus</em>) (IMAGE) North Carolina State University Caption Researchers have found that the larger the colony size associated with a eusocial insect species, the weaker its immune response. For example, honey bees (Apis mellifera) form large colonies and exhibit complex group behaviors - and they had a significantly less pronounced immune response than sweat bees like the one pictured here (Halictus ligatus), which live in much smaller groups. Credit Elsa Youngsteadt Usage Restrictions Photo credit must be given. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.