Giant hornets, which were detected in North America for the first time last year, can devastate colonies of the most common type of honey bee. But in Asia, where the fearsome predators are native, honey bees mount a vigorous defense with intimidating behaviors and coordinated counterstrikes. Now, researchers have discovered that Asian bees employ another, surprising defense strategy: To repel hornets, they daub their hives with the feces of other animals, which some scientists consider a form of tool use.