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. 2019 Dec 13;9(12):1143. doi: 10.3390/ani9121143

Figure 2.

Figure 2

The morphology of cross-beaks in Huiyang bearded chickens. (A): normal beak; (B): left-upper cross-beak; (C): left-lower cross-beak; (D): right-upper cross-beak; (E): right-lower cross-beak; and (F): polarization cross-beak.