What is it that makes animal migration such a magnificent spectacle for the eye and the mind? Is it the sheer abundance of wildlife in motion? Is it the steep odds to be overcome? Is it the amazing feats of precise navigation? The answer is all of the above. But there’s another reason why the long-distance journeys of wildebeests, sandhill cranes, monarch butterflies, sea turtles, and so many other species inspire our awe. One biologist has noted the “undistractibility” of migrating animals. A nonscientist, risking anthropomorphism, might say: Yes, they have a sense of larger purpose.