PhysOrg Posted July 21, 2017 Share Posted July 21, 2017 About one billion birds are killed every year when they unwittingly fly into human-made objects such as buildings with reflective windows. Such collisions are the largest unintended human cause of bird deaths worldwide—and they are a serious concern for conservationists. Read the full article on PhysOrg Link to comment Share on other sites More sharing options...
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