For birders, the voyage is a marvel of perseverance, wonder and — sometimes — calamity. In addition to birds who die naturally during migration from attrition, hunger or predation, researchers estimate as many as 1 billion are killed in high-speed crashes into building windows each year in the United States alone. Not only do birds fail to recognize glass, but they can often be confused by reflections or decorative trees inside building lobbies. In this video by ARTiculations Betty looks at some of the causes and solutions to this problem.
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