Poor Odors, Strength, and Persistence Give Their Rewards to Mutilla europaea Visiting Dangerous Wasp Nests

Social insect colonies are attractive for many arthropods. The rare velvet ant, Mutilla europaea, visit colonies of Polistes wasps, but to date it was unclear which resources it targeted therein. Our field observations and bioassays showed that velvet ants visit the colonies of the social wasp Polistes biglumis almost undisturbed and may feed on larval wasp saliva. Chemical insignificance and resistance are the characteristics that allow velvet ants to visit unharmed wasp colonies and gain such a nutritious reward.