If you see a Yap, Just know that you've just run into a nice chap! Yaps are small little tumbleweeds, rolling around picking up all sorts of plant life, and usually gifting some to others, even if they don't like it as much as the gifter. But not only that, when it stops, it prepares a... "wonderful" song for its comrades, which usually results in its audience screaming "MAKE IT STOP!" Don't know what that's about.