The fifth level will take a couple of tries to get. You have to hit every single pig in one go. More detail with regards to this level can be found below the video.
[youtube width=420 height=345 time=135]http://www.youtube.com/watch?v=gHi8JAEOTz0[/youtube]
As many times before, pay close attention to the location of my mouse when I release (and speed up) the bird. Replicating this can save you a lot of time. It may still take a couple of tries as the angle and speed has to be just right for every pig to pop as a result of a single hit.