Dig It:

In both religion and science, the question of what makes humans human has been debated for centuries--image of God? featherless biped? What? Some say we are the animal that laughs--but now we know that apes laugh, and anyone who owns a cat knows that they at least smirk, if not chuckle. Language?--talk to the chimps. And on the darker side, other creatures share our unfortunate predilections for cannibalism and war. But as I lean on my shovel, it comes to me that none of God's creatures except a human will spend all day digging rocks out of a field. What this says about our relative position on the evolutionary ladder, I couldn't say. But dolphins and whales gave up their hands and feet to return to the sea. Probably got tired of digging.