Resistance tells only half. A gentle paw pressing against a branch can gather a more useful mechanical signal when the force it applies is considered alongside the distance the branch bends. Movement supplies the missing measure. Within the range where bending is approximately linear, effective stiffness is the ratio of applied force to displacement, not resistance considered in isolation.
Softness can be deceptive. A branch that moves readily under a paw need not be made from weaker material, because its length, thickness and attachment all influence how much it bends under a given load. Geometry changes the answer. Flexural rigidity combines the material's elastic modulus with the cross section's second moment of area, distinguishing resistance to bending from material properties alone. Position matters as well. Pressing farther from an attachment generally produces greater displacement for the same force, meaning the paw encounters the mechanics of an entire support rather than a substance stripped of context.
Touch deserves better accounting. Cutaneous mechanoreceptors can provide information about contact and pressure, while proprioception supplies information about limb position and movement that could help relate a push to its resulting bend. Neither signal stands alone. The physical principle supports this interpretation, although demonstrating precisely how an animal combines those signals requires behavioral and physiological evidence rather than an appealing description. Gentleness has analytical value. A small probe can sample a branch's response without imposing the larger forces of full support, though it cannot certify that the branch will withstand every subsequent load. Beneath the resting paw, uncertainty bends but does not disappear.
