Predatory functional morphology in raptors: interdigital variation in talon size is related to prey restraint and immobilisation technique.

Strigiformes generally have a lower inner claw curvature than other raptors, with the difference highly significant (99.8%) for D-II (Strigiformes mean = 92.256 degrees, σ = 17.220; Accipitridae + Falconidae + Pandionidae mean = 112.823, σ = 15.964; t 29 = −3.185, p = 0.002).

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