Here's one that I don't think people are even considering. I've seen insects flying repeatedly into brightly colored non flower objects. They get stuck doing i

Here's one that I don't think people are even considering. I've seen insects flying repeatedly into brightly colored non flower objects. They get stuck doing it. So even something as simple as a small piece of colored fabric can throw bees off and there's no such thing as a forest so untouched that there isn't some human left object in it. Brightly colored objects are more common than ever too.