...................................................................................................................................ix Résumé......................................................................................................................................x Introduction...............................................................................................................................1 Thermal acclimation in ectothermic animals................................................................2 Thermal acclimation in endothermic animals...............................................................6 Study Model..................................................................................................................8 Objectives....................................................................................................................11 Material and Methods.............................................................................................................12 Acclimation Experiment.............................................................................................12 * Experimental design.....................................................................................12 * Measurements...............................................................................................12 Flight Metabolic Rate........................................................................13 Wingbeat Frequency..........................................................................15 Resting Metabolic Rate.....................................................................16 Morphometric measurements............................................................17 Maximum Nest Temperature.............................................................17 Field Sampling............................................................................................................18 * Study sites and animal collection.................................................................18 * Field data measurements..............................................................................18 Statistical Analyses.....................................................................................................19