 of exchanges between whales when they talk with one another. You know, we're not just documenting what codas, what rhythms and patterns are being said by whale A and whale B. We're looking now at how they look when they're talking and having these exchanges, these choruses of codas back and forth across time. And we find two really new features of their communication system, one which we call rubato, which is that they vary the duration of the codas across a conversation.