Too sick to fly. Immune response activation prolongs stopover duration of migrating passerines
Most migratory bird species divide their migration in stages of flight and stopovers. They use these stopovers to refuel the energy reserves needed to face their long migration journeys. These stopovers are an important element to determine the overall migration speed. Time spent on migration and arrival date to the wintering grounds have been demonstrated to have a large effects the following bre