Table 2. Number of lateralized (L: Left; R: Right) and non lateralized (N: Neutral) individuals found in each population.

	L	N	R	LI	Left %	Right %	p
Butiondo	1	6	3	0.2	28%	72%	<0.01
Caleta de Famara	0	5	5	0.5	13%	87%	<0.001
La Oliva	0	4	6	0.6	8%	92%	<0.001
Nazaret-Teguise	0	9	1	0.1	41%	59%	>0.05
Yaiza	1	7	2	0.1	10%	90%	<0.001
Species Level	2	31	17	0.3	22%	78%	<0.001

Lateralization Index (LI) = (right runs−left runs)/(right runs+neutral runs+left runs). Left% and Right% represent the percentage of times that all the lateralized individuals (left and right) chose the left or right refuge. Fisher exact test P two-tailed was used only with lateralized individuals, in order to test if left- and right- lateralized individual were equally common at population or species level (see also Figure 2).