(Try National Geographic's online bird identifier.) A Towering Problem for Birds. Birds often hit objects in flight, especially "tall buildings in cities, or cell phone towers, ...

• Start by trying to identify which species of birds come to your feeder. If that task sounds daunting, don’t worry! The Cornell Lab of Ornithology has a free, easy-to-use bird identification app.

This story appears in the January 2018 issue of National Geographic magazine. ‘If you take care of the birds, you take care of most of the big problems in the world.’ That’s what Thomas ...