I would disagree, respectfully...just because it looks like the background could be distracting and you want the whole focus of the shot on the praying mantis. I feel that if the background doesn't add something to the subject of the photo, it's best to blur it.
Okay, maybe I should rephrase: I agree with that, obviously a fully focused background could be distracting. However, 2 this pop out at me, 1.) Even just the back of the wooden post the mantis is on is out of focus. And 2.) I just think that the background could have been a little less blurred -- because to me, a blur of splotches and colors in the background just seems unrealistic to me. Yeah, I guess that's just it, realism. But, to each his own. Either way, it's a great shot.