Species Explanatory variable Estimate SE Z P
Vipera graeca (Intercept) -6.345 14.131 0.449 0.653
Height of closed vegetation (HCV) 0.073 0.029 2.444 0.014
Shrub surface cover 0.089 0.149 0.594 0.552
Grass surface cover 0.081 0.200 0.409 0.682
Rock surface cover 0.058 0.205 0.283 0.777
Maximum height of vegetation (MHV) -0.004 0.011 0.401 0.688
Vipera renardi (Intercept) 0.315 1.360 0.232 0.816
Burrow availability 0.184 0.078 2.358 0.018
Foliage height diversity (FHD) -0.442 0.240 1.842 0.065
Leaf area (LA) 0.002 0.001 2.980 0.003
Maximum height of vegetation (MHV) -0.003 0.008 0.458 0.646
Vipera ursinii (Intercept) -1.261 2.893 0.436 0.663
Foliage height diversity (FHD) -0.779 0.475 1.641 0.101
Maximum height of vegetation (MHV) 0.016 0.008 1.987 0.046
Leaf area (LA) 0.003 0.001 2.266 0.023
Height of closed vegetation (HCV) -0.074 0.033 2.230 0.025