 So all of these features suggest that this language, as you have said, is more complex maybe than we might have thought and can be used to express a wider variety of things. So the next step is how do these things vary in the behavior context? Is it amongst two mothers or is it a mother and calf? Is it two cousins or two animals from two different whale families? That's where we start connecting all of this potential variability to the context of when and where and how.