Table 1.

Digging dynamics and nest geometry values for experiments showing the two morphological transitions (granular n = 12, cohesive n = 24).

	mean ± s.d.		Mann–Whitney
	granular	cohesive	U	p
geometry
ω1	0.52 ± 0.09	0.58 ± 0.06	78	0.026
ω2	1.61 ± 0.52	1.14 ± 0.45	216	0.015
γ1	1.76 ± 0.26	2.03 ± 0.55	104	0.188
γ2	7.58 ± 6.45	4.62 ± 3.30	194	0.097
dynamics
A1	11.94 ± 6.13	5.99 ± 2.55	245	<0.001
A2	15.38 ± 6.46	9.47 ± 4.51	236	0.001
R1	0.547 ± 0.535	0.484 ± 0.290	162	0.562
R2	0.222 ± 0.304	0.246 ± 0.205	171	0.379
ρ1	0.063 ± 0.079	0.096 ± 0.065	101	0.156
ρ2	0.016 ± 0.022	0.033 ± 0.037	92	0.084