When Spanish bullfighter Serafin Marin plunges his sword into the back of a bull's neck in Barcelona on Sunday, he will be marking the end of an era. The bull will not only be the last of six killed in the bullfight, but the last-ever to be killed in Barcelona's Monumental bullring, which is nearly a century old. The closure of the Monumental - in keeping with a bullfighting ban in the north-eastern region of Catalonia - reflects the decline of bullfighting in Spain, though fans of the country's 'national fiesta' vow to fight on. 'We have lost a battle, but not the war,' Marin told the daily El Mundo. But animal rights campaigner Aida Gascon said, 'Now that we have achieved (the end of bullfights) in Catalonia, we shall try to finish...