carrotid arteries
Da veins in Brer Rabbit's neck dat enable him to out-think --- and also out-RUN, when necessary --- his bigger-but-less-clever enemies like Brer Fox, Brer Wolf, and Brer Bear.
Just like Brer Rabbit, Bugs Bunny also needs to always have his carrotid arteries in top form in order to outwit --- and often to out-maneuver, as well --- his assorted bang-stick-wielding nemeses like Yosemite Sam and Elmer Fudd.