Sirus Gaming: “Mules are one of the most persistent enemies in Death Stranding. 2nd only to the BTs themselves. Accidentally trigger one of their sensors and theyll swarm around you in no time. Unfortunately for you, Death Strandings combat is few and far between the gameplay that youll barely have time to master the basics.”
Source: N4G PC Death Stranding Guide: How To Take Care of MULES Fast