Natural rivalries are common. Dogs and cats are considered common foes even though many dogs and cats get along just fine. The Soviets and Chinese are traditional enemies yet they often cooperate. So too the oil and gas attorney and the landman. Probably because of the nature of the roles, they are commonly pitted against each other. In fact, in the field, it is more the rule than the exception, to her the landman criticize the attorney and the attorney scorn the landman.