Just look for the long neck covered in white feathers.That, officials say, could be the key to recovering the female African white-backed vulture that escaped from the Dallas Zoo over the weekend.More than 150 bird-watchers reported sightings of the bird by Monday afternoon -- some coming from Lake Lewisville, Arlington, Mansfield, even Fort Worth -- but none panned out, zoo officials said."People are being great," said Susan Eckert, a zoo spokeswoman. "But a lot of the reports are of different birds: red-tailed hawks, turkey vultures and black vultures."This is the latest of several known escapes in recent years from the...