What is that yellow-orange, waxy substance that I find on my car's paint all the time, in the form of neat little spots?

Some say it is dumped jet fuel, others say it’s droppings from bees, and still others say it’s droppings from birds. What’s interesting is that everyone who I’ve asked was absolutely positive they were correct which, as you can see, is not possible. I believe the prevalence of the substance is seasonal, with more spots in the warmer months here in San Diego, California.