It's Ulf Muuss's job to keep birds off the runway at the Cologne-Bonn airport.
Pigeons and doves often symbolize love, peace and reconciliation in art. But they're no longer welcome at Cologne Cathedral because of their destructive droppings.
As spring begins we can hear the birds returning from winter. But why do they migrate? Are they coming back early this year? And why are they so loud?
Hundreds of errant flightless birds have confounded attempts to control their population and are gobbling up farmers' crops. North German agriculturalists want to start shooting the birds, but face legal hurdles.
Colombia teems with birds, but until recently fighting between the government and guerilla groups scared visitors away. Now, former war zones are fast becoming bird-watching hotspots. And that could help preserve them.
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