Table 1. Summary of a General Linear Model examining variation in the ‘flight distance’ of incubating zebra finches when approached by a human observer.

Note that non-significant interactions are not included for reasons of brevity.

Explanatory term	Effect size	F-value (df = 1, 195)	P value
Partner present	0.487	95.043	<0.001
Colony size	0.010	2.011	0.158
Habitat type	0.010	2.001	0.159
Approach direction	0.005	0.959	0.329
Focal bird sex	0.00003	0.063	0.803
Conspecific present	0.00003	0.063	0.803