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So, what the prairie dogs do in order to make these sounds is that they actually have sublharmonic variations that occur within the acoustic waveform. So, this is a very fancy way of saying that they're basically shifting the frequency or the tally of harmonics. And if you're looking at this visually, it looks like sort of chevrons. If you're looking at it through a waterfall or something of that nature, you're basically looking at the harmonics and they display sort of a chevrons if you can think about it like that, right? And what the researchers did is they broke the calls into 25 equal size time slices and they isolated the two most energetic resonance frequencies. So, these are called formants within each partition.