The problem is exacerbated by the migration's timing, as many birds fly at night. Attracted by the glow of skyscrapers in the dark, they are vulnerable to collision -- either with each other or the buildings. For some, the light can prove so disorientating that they flutter around for hours, eventually becoming exhausted and landing in inhospitable environments.

Birds can also become confused by windows with plants behind them, mistaking them for a safe landing spot.
Reflective glass next to gardens and parkland can also prove problematic, promising a safe haven where none exists.

Authorities encourage owners of tall buildings to turn off lights during the two migration seasons to help protect the birds and reduce energy costs.

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