Table 1.

Spearman correlations between the estimated ω for branches: Flight vs Non-Flight Birds and Other Mammals vs Bats

	Flying Birds	Flightless Birds	Bats	Flightless Mammals
Flying Birds	-	0.883	0.605	0.717
Flightless Birds		-	0.579	0.668
Bats			-	0.833
Flightless Mammals				-

All correlations are significant at the p < 0.01 (2-tailed). The sample used for the correlation, list-wise n = 85