Fig. 2

Boxplots comparing canopy cover, width (cm), and depth (cm) of the two streams selected (Selected) by Atlantic Royal Flycatchers for nest construction joined together (n = 30 sampling points), and the two streams not used by the birds (Nestless) (n = 30 sampling points). Bold lines represent medians; the boxes delimit the upper and lower 25% quartiles; the dashed lines indicate the maximum and minimum values, and circles represent outliers. T-tests indicated that these streams have differed in width (t = − 12.6, p < 0.0001), and depth (t = − 6.9, p = 0.0001), but not in canopy cover (t = 0.1, p = 0.96)