Table 1. Average values of chick status, grit amount, and grit size.

Note that average sizes of offered and remained grit cannot be calculated, but assumed from the amount of stones ingested per size class. See Fig. 3 and Table S3 for detail. Abbreviations: H-lM, herbivorous diet with a less-muscular gizzard; H-M, herbivorous diet with a muscular gizzard; nH-lM, non-herbivorous diet with a less-muscular gizzard; nH-M, non-herbivorous diet with a muscular gizzard.

	Chick (g)				Grit amount (g)						Grit size (mm)**
	Body mass	SD	Gizzard mass	SD	Ingested	SD	Gizzard	SD	Feces	SD	Uningested	Gizzard	SD	Feces	SD
Raw values
H-lM	182.736a	33.769	7.531	1.484	4.852ab	3.484	1.305	0.525	0.09*	NA	NA	1.884ab	0.340	0.960a	0.377
H-M	153.403bc	26.688	7.863	1.483	3.657	2.572	1.118	0.498	0.26*	NA	NA	1.743acd	0.355	0.975bc	0.505
nH-lM	225.163b	56.007	6.636a	1.501	1.879a	1.252	0.781	0.634	1.34*	NA	NA	2.003ce	0.413	1.273abd	0.556
nH-M	250.977ac	44.363	8.205a	1.227	2.318b	1.810	0.919	0.784	0.83*	NA	NA	1.883bde	0.512	1.138cd	0.500
Relative to body mass
H-lM	NA	NA	0.041abc	0.041	0.026ab	0.004	0.007ab	0.003	NA	NA	NA	0.332ab	0.055	0.169a	0.066
H-M	NA	NA	0.051ade	0.051	0.022cd	0.006	0.007cd	0.003	NA	NA	NA	0.326c	0.065	0.182b	0.094
nH-lM	NA	NA	0.030bd	0.03	0.009ac	0.005	0.003ac	0.003	NA	NA	NA	0.329ad	0.067	0.209abc	0.091
nH-M	NA	NA	0.033ce	0.033	0.009bd	0.004	0.003bd	0.003	NA	NA	NA	0.298bcd	0.087	0.180c	0.079

Notes:

^*Total amount excreted on the last day of the experiment, evaluated on group basis.

^**Grit size are averaged and compared by grit basis instead of individual basis, unlike chick status and grit amount.

^a–eMeans within a column sharing a common superscript differ significantly at p < 0.05.