JEB -- van Gils et al. 206 (19): 3369 Figure IG2

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Fig. 2. Gizzard mass estimated ultrasonographically in the three experiments as a function of the hardness of the staple food on offer. Values are means ± S.E.M. In all three experiments gizzard size manipulations were successful: the effect of the hardness of the diet on gizzard mass is significant (P<0.01).