A bumblebee's bum. Nice shot of it too. technically a good picture, although I would have cropped the picture down to put more emphasis on the bum, I mean the bumblebee.
I think this is a thistle and that is the business end of a bee. I, too, think there is too much blurred area. I also think this shot would have been improved with a bit more purple flower...but when the sun is shining, you have your camera and the best moment (or bee) comes...you clickit! The blossom on the right looks about to flower; I hope you go back and take a nice macro of it as well.