Birds do it, bees do it

and sometimes, hover flies show up to watch.

At first I didn't realize what I'd caught at the time I was taking these photos.  I began out front, snapping the bees working the spineless prickly pear blossoms (Opuntia ellisiana).  There were loads of flowers and even more bees, diving in to get their fair share.  [I took a deep breath and attempted my own identification efforts this time - all mistakes made here are solely my own!]

I believe this is a Mason or perhaps a Leaf Cutter Bee (Megachilidae). They carry pollen on their belly rather than in pollen baskets on their legs.

Non-native Apis mellifera - the European Honey Bee

Lots of honey bees - someone has been doing their waggle dance!  Note how full their corbicula (pollen baskets) are.

So far, so good.  I moved out back where I spotted more bee activity on a Mexican Hat (Ratibida columnifera), and in addition noted a couple of Syrphid flies hanging in the air close by.  A three-fer! I moved in to see if I could capture the action.

Capture the action? Boy, did I ever.  I almost blushed when I enlarged the photos on my computer and got a better look at everything going on.  

These are some form of Ceratina, small native carpenter bees, that nest in pithy stems.

You don't need a degree in entomology to determine what is happening here.  Jeepers. Ahem!  The Great Circle of Life!

Afterwards, one of the bees stuck around and continued to feed.  The Syrphids, better known as hover flies, stuck around too, and I don't even want to speculate as to why.    

Brings a whole new level of meaning to "busy as a bee" doesn't it?