Every little thing we do is still behavior.
When we pee it comes out of us in a certain way. Most of us never think about it. We assume that it comes out of us exactly the same way for every person on the planet.
A doctor of pee (or a urologist / urogynocologist) probably thinks differently, because they get to see pee in many people. For me, you see, pee can come out in two separate streams! How is that?
How common is it? How many variations are there? That’s behavior for you. It’s small. It’s kind of gross. But it’s the kind of thing we should pay attention to. Especially when it comes time to clean the toilets!