Table 1.

Results of multivariate PGLS models explaining variation in migration distance across 91 species of birds.

full model				minimal model
predictor	β (s.e.)	t	p-value	predictor	β (s.e.)	t	p-value
(intercept)	–0.50 (4.58)	0.11	0.9138	(intercept)	–4.89 (2.20)	2.22	0.0290
body mass	1.02 (0.94)	1.09	0.2780	body mass	0.96 (0.80)	1.20	0.2333
aspect ratio	11.09 (2.05)	5.42	<0.0001	aspect ratio	11.05 (1.89)	5.85	<0.0001
wing area	0.32 (0.88)	0.37	0.7156	brain mass	–4.83 (1.15)	4.21	0.0001
brain mass	–15.17 (9.13)	1.66	0.1004	size of optic lobe	2.69 (1.25)	2.15	0.0345
size of telencephalon	7.29 (6.46)	1.13	0.2623
size of optic lobe	3.69 (1.65)	2.23	0.0285
size of cerebellum	1.44 (2.03)	0.71	0.4799
Pagel's λ = 0.76, n = 91, R2 = 0.47				Pagel's λ = 0.80, n = 91, R2 = 0.46