That had occurred to me during my original experimenting, so I procured an ant trap (piece of paper for it to crawl on), and captured the beast. I then transported it to a remote location (further down the sidewalk), and released the creature into a previously drawn circle of chalk. After about 2 minutes, the ant did cross the line, but up 'till it crossed the line, it turned around each time it came to the line. I thought that what probably happened is that it was marking its trail inside the circle, and finally “realized” (after crossing his own trail several times) that it was trapped. At this point it had no “choice” but to cross the line.
By the way, when that dang ant crossed the line, I had to put my foot down. Bwahhahaha