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And it appears that they do this. I have a prevailing theory with this. There's a few up there, but I just went with the prevailing theory, is that they bob their heads while they're motioning. You see them walking along, they're bobbing their heads. And this is to stabilize their visual surroundings. And it's much the way we move our eyes to do the same thing as we're walking around, we're moving our head and our eyes at the same time to try and stabilize everything that's going on around us. So that's what they think of the word do. We all think of the other theories as to if they're bobbing their heads, it's not stabilizing the shifts. They're moving and keep themselves from the feet.