Table 4. Pearson correlation and p-values between beak dimensions corrected for beak length and safety factors extracted from the different models.

	bottom keratin thickness / beak length	top keratin thickness / beak length	beak depth / beak length	beak width / beak length
safety factor base biting	0.80 (p = 0.001)	0.25 (p = 0.40)	0.71 (p = 0.006)	0.68 (p = 0.011)
safety factor tip biting	0.90 (p < 0.001)	0.65 (p = 0.015)	0.88 (p < 0.001)	0.88 (p < 0.001)

Bold values illustrate significant correlations (p<0.05/4, Bonferroni correction) between safety factors and anatomical features.