Figure 3From: Melatonin reduces migratory restlessness in Sylvia warblers during autumnal migrationMean (± sem) body weight of blackcaps and garden warblers at the time of putting them into the cage and at release. The availability of food had a significant effect on the variation of body weight between caging and release (see text and Table 2 for details). Numbers above columns indicate sample sizes.Back to article page