Table 1.

Statistical summary of multiple linear regression models predicting hourly longitudinal bird speed (U_bird) as a function of zonal (U_wind) and latitudinal (V_wind) wind components encountered en route. (Intercepts estimate the mean U_bird in the absence of wind. The most parsimonious model is given in italics.)

	intercept		βUwind		βVwind		βUwind : Vwind		AIC	adjusted R2
	estimate	p-value	estimate	p-value	estimate	p-value	estimate	p-value
model 1	−0.63	3.02 × 10−20	0.53	3.46 × 10−245					13478.50	0.36
model 2	−0.76	4.44 × 10−28	0.52	3.11 × 10−243	−0.15	1.55 × 10−20			13394.09	0.38
model 3	−0.76	5.67 × 10−29	0.47	1.13 × 10−187	−0.11	4.83 × 10−11	−0.03	1.17 × 10−9	13313.64	0.40