CHICAGO — Annette Prince peered between glossy downtown buildings: ”There’s a bird in that grate.” Sure enough, sitting very still in the rain was a tiny white-throated sparrow, so drenched you could barely make out its canary-yellow face markings. The bird was too dazed to move — an easy target for the hungry seagulls that were patrolling the area. Prince looked up at the nearest skyscraper, .