Table 2.

Pairwise comparison of foraging trip duration during incubation for each deployment type. Significant values (p < 0.05) are in bold.

Device A	Device B	Mean diff (A − B)	t value	p
No device	GLS	− 0.8 ± 0.9	− 0.9	0.791
	GPS	− 5.1 ± 0.9	− 5.1	< 0.0001
	Combined	− 5.0 ± 0.8	− 6.0	< 0.0001
GLS	GPS	− 4.3 ± 0.9	− 4.6	< 0.0001
	Combined	− 4.2 ± 0.6	− 6.5	< 0.0001
GPS	Combined	0.1 ± 0.9	− 0.1	0.999