location(egg, duck_pen).

dynamic location/2.
dynamic(location/2).
dynamic(location)/2.

No permission to redefine built-in predicate `(dynamic)/1'
Use :- redefine_system_predicate(+Head) if redefinition is intended

?- retract(location(egg,duck_pen)).
ERROR: retract/1: No permission to modify static procedure `location/2'