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. 2009 Nov 25;4(11):e7999. doi: 10.1371/journal.pone.0007999

Figure 4. Bivariate plots of claw morphology illustrating family level differentiation.

Figure 4

(A) Raptors show variation in the relative size of D-I and II claws among families; Accipitridae have hypertrophied D-I and II claws; Falconidae have only slightly enlarged claws on D-I and II; Strigiformes and Pandionidae have claws that are all similar in size. (B) Falconids can be most easily differentiated from non-raptors by the greater inner curvature of D-II claw, and that the D-II/D-III claw arc length ratio is greater than or very close to 1.