英語時差：會發(fā)射紫外線的蜘蛛（下）

Craig and Bernard did laboratory experiments showing that fruit flies are two to three times more likely to fly toward a simple web reflecting ultraviolet light than toward a web not reflecting it. Craig and Bernard also found that many spiders, especially those who forage near flowering plants, make non-ultraviolet-reflecting webs, then sometimes decorate the webs with special ultraviolet-reflecting silk laid down in flower-like patterns. The bodies of these spiders also reflect ultraviolet light. The two scientists observed webs built by a type of large garden spider in Panama and found that decorated webs with spiders present caught fifty-eight percent more insects per hour than undecorated empty webs.