Have you been surprised by seeing gulls eat waffles in the street while others follow fishing boats at sea or eat in fields behind tractors? You were maybe observing the Lesser black-backed gull, a long-lived-migratory bird! Some individuals will always do the same thing or go to the same place (specialists), while others may keep all possibilities and explore different habitats (generalists). You wonder: Why so much variation? How do foraging strategies develop? What is the link with personality? What would happen if some resources were not accessible anymore due to global changes? Come to the talk to know who will be the winners or losers.