Neighbourhood Flying Foxes

For a year or more, at the edge of a golf course in my local area, a fairly large flying fox colony has taken up residence in some trees which are clearly visible from a road I drive along nearly every day.

I've been meaning to tax some photos, which I finally got around to doing on Sunday.  First a few zooming in on the colony:

And now a short bit of video:

One thing I don't understand about flying foxes is this:  they are black winged and dark furred, yet they are happy to roost in these trees which don't provide shade.  In Brisbane, if I wore a black leather coat and hung in the sun for the entire daylight hours, I would expect to be way too hot for about 90% of the year.   Why don't these animals find shade? 

I see from a bit of Googling this book section about their thermoregulation (and other matters):

Somewhat interesting, but instead of all that wing fanning and (according to another website, body licking) that they do to keep cool, why not just find more shade?