Table 1. Beta regression model of the proportion of terrestrial food in diet of free ranging chicks in relation to sex and age period.

	Estimated marginal mean proportion ± s.e	χ2	d.f.	p-value
Sex		2.06	1	0.151
Female	0.33 ± 0.03
Male	0.28 ± 0.02
Age		0.18	2	0.916
0–10 days	0.31 ± 0.03
10–20 days	0.31 ± 0.03
20–30 days	0.29 ± 0.03