School buses are orange so you'll notice them and take care to avoid harming the youngsters as they exit the door helter-skelter. I almost always take a window seat on the plane, and one of my amusements is to see how long it takes to spot a school bus as we descend.
If you are a small fish in a brownwater pond, it's probably best not to be the colour of a school bus. It would be unfortunate if your progenitors had been selectively bred to be the colour of a school bus, and then a couple, specifically Mom & Dad, had been dumped into a brownwater pond.
Heron, grebe, osprey, kingfisher and so on.