International audience ; For small insects, such as honey bees, foraging represents an incredibly costly behavior. Large amounts of energy are required to keep body temperature warm, to lift body weight and fly across long distances toward food resources, to carry heavy nectar, pollen, water or resin loads, and to maintain a functioning brain for memory activation and navigation. Impressively, honey bee foragers have evolved a multitude of individual physiological and behavioral strategies to reduce these costs, thereby maximizing the overall energetic gains and efficiency of foraging. This includes leaving the nest with fuel load, carefully selecting the most rewarding plants or feeding sites, adjusting the food load they carry back to the colony nest, minimizing travel distances between patchily distributed food resources, and using the sun and warm flowers to increase their body temperature. In addition, honey bees can conserve energy in an ectothermic resting state, but generate heat from their flight muscles and become endothermic when needed. In a global context of climate changes, it seems essential that future research clarifies the flexibility of these strategies of energetic regulation, and how they may vary across populations and species facing different climatic conditions and foraging environments.