Table 2. Results for the non-parametric median test and the pairwise comparisons.

	Curvature	Test Statistic (d.f.)	p-value
All extant data	Inner	273.5 (3, 711)	<0.001*
	Outer	150.7 (3, 732)	<0.001*
Bird only data	Inner	246.3 (3, 668)	<0.001*
	Outer	149.6 (3, 694)	<0.001*

^*denotes a significant p-value (<0.05).