For the same feature, distinguish the relation involved:
Relative to human: rational is constitutive, because it contributes to the species' essence.
Relative to animal: rational is divisive, because it separates rational from non-rational animals.
It would be incomplete to call it only constitutive and deny its divisive role. Ask 'relative to what?' The classification changes with the genus or species being considered, not because the feature itself has changed.
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The Five Predicables: Differentia, Property, Common Accident, Essential and Accidental Attributes
For the same feature, distinguish the relation involved:
Relative to human: rational is constitutive, because it contributes to the species' essence.
Relative to animal: rational is divisive, because it separates rational from non-rational animals.
It would be incomplete to call it only constitutive and deny its divisive role. Ask 'relative to what?' The classification changes with the genus or species being considered, not because the feature itself has changed.