The iconic towers were destroyed after being struck by hijacked passenger planes on Sept. 11, 2001, killing 2,753 people. It's lit from dusk to dawn — though not always continuously — every Sept. 11 in memory of those who died in the attacks. Extreme lightsThe Tribute in Light is an extreme example of such lights — but birds are irresistibly attracted to the bright memorial. Video recorded on Sept. 11, 2010, shows a flurry of what look like hundreds of insects circling aimlessly through the light beams. "The worst-case scenario is that there are birds that collide with buildings, or the light directly results in the mortality of birds," Horton said.

Source: CBC News September 11, 2018 08:00 UTC