
Tiny black bees (probably some species of Chelostoma, but the entomologically inclined are earnestly invited to correct us) enjoying flowers on two slightly different shades of Butterfly Weed (Asclepias tuberosa).

That pun works better in conversation than in print, but here is a movie of bees pollinating Hibiscus syriacus flowers, set to the music of Adolph Krantz. You can go to the Wikimedia Commons hosting page for the HD version.
Father Pitt believes this is Agapostemon virescens. The world of entomology is one old Pa Pitt wishes he had entered into earlier; a whole universe of fascinating wildlife surrounds us, and some of these animals are shockingly beautiful. The flower is a Marsh Mallow (Althaea officinalis).