I didn't see a problem from vultures on cars, erxcept for a little whitewash. The cars aren't going to burst into flame, as they do from pack rat nests.
Why do they stand on cars? Probably several reasons:
- First, there aren't many open places in the Evergaldes for vultures to congregate--since the surface everywhere is covered with either water or dense vegetation. And the parking lots have an added attraction--the chance for garbage.
- The cars park in what little shade there is, and of course, vultures like the shade.
- Vultures are probably safer on cars--mammalian predators can't sneak up on them there.
- Vultures like to hang out on cliffs, where it's easy to get airborne and there isn't vegetation to interfere with their big wingspread. To a vulture, a car is something like a cliff--an easy place to take flight from.

I was surprised that they were hanging out around people, and asked him about this. He said: "Oh, they are intelligent birds. They are curious. They like to see what's going on." I suppose, if you are a vulture in the wild, you might hang out at the water hole. Animals come and go, including sick animals. So, being "where the action is" might just be adaptive for a scavenger.
So... maybe this explains why Everglades vultures like to hang out in parking lots.
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