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Results of the validation measurements. Black lines indicate the results of the validation FE model, grey lines the average (of three specimens) of the corresponding bending experiments. Dashed lines represent a loading at the rostral-most part of the keratinous upper beak (R2 = 0.97), full lines represent tip loading (R2 = 0.89) and dotted lines represent centre loading (R2 = 0.89).
