It's Ulf Muuss's job to keep birds off the runway at the Cologne-Bonn airport.
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?
An out-of-control bushfire is threatening a prime koala breeding ground. Already rare in numbers, the Australian marsupial has long battled the threats of urbanization and land clearance.
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.
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.
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