Bees galore in the mornings (not bumblebees)

The squashes and zucchinis are abuzz with bees every morning when I do the morning rounds.  They aren't bumblebees, they're much smaller.  Pretty sure they're bees, not wasps.

I assume they are the reason why the males have no pollen left on them.  The pollen tends to have fallen into the bottom of the flower.  So I've been having a harder time doing the pollination, using whatever pollen I can get.  Hopefully the bees are doing it anyway, but I'm continuing, just in case.