A she-sparrow eyed a spider that hung in its web. As she stretched her neck forward toward it, the spider vanished into a brownish blur, vibrating like sand on a drum-head. The sparrow drew back, cocking her head and looking stupid. A spider body came back into focus. The sparrow stretched forward again and again the spider blurred. The sparrow sat perplexed for a moment before some distraction sent her flitting off noisily with the other sparrows. The spider hung in its web.