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. 2020 Sep 11;8:129. doi: 10.1186/s40168-020-00896-9

Fig. 1.

Fig. 1

The fostering experiment on the zebra finch–society finch system. We performed a cross-reared experiment using the zebra finch (ZF)–society finch (SF) fostering system and sampled the gut contents of zebra finch hatchlings that were (a) raised by their biological brood parents (ZF-reared chicks), (b) foster parents (SF-reared chicks), or (c) hand-reared (the control group, excluding maternal influence). (d) Sampling design of the cross-reared experiment. Illustration by Hsiang-Ching Chen