Don't know. It's true that an all-out battle is too risky a proposition. But Chimps e.g. are known to patrol the border areas of their territory in order to cat

Don't know. It's true that an all-out battle is too risky a proposition. But Chimps e.g. are known to patrol the border areas of their territory in order to catch and kill stray members of neighbouring troupes. You can call that a murder, but I'd go with low-intensity warfare.