The Eyes of Wild Creatures
There is a theory that the eyes of wild creatures magnify things seen, so that they appear many times larger than to human eyes. This has been held to explain why creatures smaller and weaker than man, like hares and rabbits, flee desperately at his approach—a reasonable habit if all men to them are as giants. One's sympathies would go out to the rabbit if he sees foxes as horses, and weasels as foxes. If birds' eyes have magnifying power, many miracles of flight and of feeding would seem natural. The swift passage of birds through obstacles that appear to our eyes to be almost impenetrable is something of a miraculous nature. Without a moment's survey of difficulties or direction, a bird flashes through a jungle where there is no possible way for it to be found by human eyes. The blackbird flies shrieking in and out of a dense hedge of thorns; but not a feather is ruffled in the course of his intricate flight. Or watch the jay or the sparrow-hawk passing at speed through an almost solid network of twigs and stems. The human eye cannot properly follow this performance by the sparrow-hawk; a swish and a streak of bluish grey, and it is gone. Many a bold jay, finding itself caught between beaters and guns, has saved its life by this wonderful power of flight at speed, going away without giving the slightest chance for a shot; it will dash out of a wall of undergrowth on one side of a ride sheer into another wall. No doubt the jay knows to an inch which is the shortest cut out of man's sight. Hardly less wonderful than birds' flight through crowded obstacles is the way in which rabbits scurry and twist through masses of fern and brambles. But where the theory of eye magnification would seem most probably true is where tits and goldcrests are searching for food on the underside of fir boughs, and finding food which no man's eye could see unaided.
