“Why did the chicken cross the road?” people want to know. People are so curious! “Well, why did the chicken cross the road?” you say. “I’m glad you asked” I say, because I do believe I have the final answer.
The answer is that the chicken, in his own little mind, never really did cross the road! To ask why he crossed the road requires that one also ask “Why did the chicken cross the shoulder of the road?” or “Why did the chicken cross the ditch?” or the field, or even, go under the fence? Truth is, a chicken wouldn’t recognize a road if he crossed one! One may as well go right to the ultimate issue and ask; “Why did the chicken walk?” Because the only reason the chicken ever did cross the road is that he happened to walk, then inadvertently came to one side of the road, chanced to transect the road, and accidentally, did not turn around.
As a matter of fact, an equivalent question might be; “Why did the worm cross under the road?” In both cases, the road is totally irrelevant! Neither the chicken nor the worm ever knew the road was there!
So the reason the silly goose, I mean chicken, crossed the silly road comes down to the principle of diffusion. Only diffusion can explain why the chicken walked, or to be more accurate, why the chicken walked so far. He crossed the road, just as herds of animals have crossed land bridges, as people groups have spread up or down coastlines, and as settlers have filled in the empty spaces across continents, simply because of the populating pressures behind them.
One chicken alone in the barnyard would probably never find his way to the road. Without any fellow cluckers to pressure him, he would only cross the feedlot or the driveway, or possibly pass into the nearest field just a bit. The lone chicken would fill his own personal space and stay there. Two chickens would fill, and spread into, a little more space and be content.
But when the fence needs mending, and the dog is asleep, and the coop is overflowing, a myriad of chickens will overflow far and wide until sooner or later one will cross the road.
Any more questions?