A Japanese zoo staged an emergency drill on Thursday, simulating a scenario in which the zoo's gorillas escape following an earthquake. Dressed in a gorilla-like costume, one member of staff ran through the zoo before being overwhelmed by other zoo workers with nets and 'sedated'. More than 150 members of staff were joined by members of local police and fire departments during the escape drill at Ueno Zoo in Tokyo. Toshimitsu Doi, the zoo's director, said the drill was successful and stressed the importance of being preparing for the unexpected. euronews: the most watched news channel in Europe Subscribe! http://eurone.ws/10ZCK4a euronews is available in 14 languages: http://eurone.ws/17moBCU In English: Website: http://www.euronews.com/news Facebook: http://www.facebook.com/euronews Twitter: http://twitter.com/euronews Google+: http://google.com/+euronews VKontakte: http://vk.com/en.euronews