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TO GO WITH STORY BY ROLAND LLOYD PARRY A Tawny owl (Strix aluco) sits in a cage at the Brinzal aviary, an owl-rescue charity based in a Madrid park on November 25, 2014 part of its convalescence following an ailment. AFP PHOTO/ GERARD JULIEN (Photo credit should read GERARD JULIEN/AFP/Getty Images)

TO GO WITH STORY BY ROLAND LLOYD PARRY 
A Tawny owl (Strix aluco) sits in a cage at the Brinzal aviary, an owl-rescue charity based in a Madrid park on November 25, 2014 part of its convalescence following an ailment.  AFP PHOTO/ GERARD JULIEN        (Photo credit should read GERARD JULIEN/AFP/Getty Images)