I didn't know until this time last year [when I took a similar pic - sedum instead of pansy] that there are over 250 kinds of bumble bees. Also, it seems that the female can receive sperm from a male and store it for later. Before she lays an egg, she decides whether or not to use the sperm to fertilize it. Non-fertilzed eggs grow into males, and fertilized eggs grow into females and queens.
Great shot, love all the hair :)