Itsy bitsy bug

When I am sitting outside reading a book I keep seeing little bugs crawling across the page.  I'm sure you know the ones I mean, not big enough to see any detail, but just big enough to be seen.  Like me, you probably either brush them off or squish them.  If so, hope they don't come back in a super-size to seek revenge.....

This is 30 images taken with my Nikon D80 on the Nikon Alphaphot 2 and stacked using Photoshop. The maximum length of the little critter is less than 1mm.