Fig. (3) Venous blood glucose concentrations (mg dL^-1) of Titmice captured west and east of the Balcones Escarpment (BE) based on relative monthly rainfall data. Black-crested Titmice are represented by solid triangles and Tufted Titmice represented with open triangles. Titmice captured west of the BE had relatively increased concentrations of glucose than those captured east (R²=0.33, p<0.001). Concentrations were further elevated west of the escarpment during months of relatively high rainfall (BE p<0.001, relative rainfall p = 0.34, BE*relative rainfall p = 0.03; whole model R² = 0.38, p<0.001; Table 4).