Again, while photographing plants for a personal identification guide, I noticed there is much more going on in the photograph than plant identification.

I wonder what these flies are doing on this Echinodorus paniculatus flower.  There is a pair for each petal; are they a breeding pair?  If so, will they lay eggs and form a gull or otherwise use the Echinodorus has habitat/food?  Are they simply attracted to the white?