Figure S5. Fit of robust linear regression models to four

Elevational temperature gradient
25
20
15
10
5
0
2
3
4
5
6
0.0
0.2
Temperature anomaly (°C)
0.4
0.6
0.8
1.0
Range shape
Elevational temperature gradient
25
20
15
10
5
0
4
5
6
7
2
log10 Range size (km )
8
0
20
40
60
80
Range orientation
Figure S5. Fit of robust linear regression models to four predictors of elevational
temperature gradients estimated within the geographic ranges of 4,978 bird species. Red
points and lines are threatened species (n = 766) and green points and black line are nonthreatened species (n = 4,212).