Well - it's not a depth of field thing - the forground is sharp, and the tiny hairs on the far side of the bee's body are sharp - but the hairs on the close side of the body are not. I wouldn't think it would be a motion thing - don't see how a bee could move half his body and not the other half. Could this have been something like a water drop on the lens or condensation? Was this shot digital or film? (perhaps a bubble in the processing or shmutz or condensation on the raw film...?)