Update:
It’s that time of the year again!
AFP News. Feb. 20. 2008—Zoo staff spread a net to catch a fake zebra, which made a break for freedum from its cage, as it strolls in the zoo park during the annual exercise for runaway animals at Tokyo’s Ueno Zoo on February 20, 2008. Some 150 zoo staffs and policemen participated in the annual exercise.
Previously posted on Feb. 28, 2007….
Every year the Tama Zoo has this “escaped” animal drill. However, the 3Yen found out last year about the scary truth in, Tama Zoo Reveals Secret. Now, there are more revelations about the zoo…
‘Don’t cry children, I was only aping about’
The Daily Mail, 20:55pm on 27th February 2007
As acting goes, it was a little too convincing.
The idea was to test the readiness of zoo staff for the escape of a dangerous animal.
But despite the ludicrously obvious disguise of the runaway beast, its pre-ordained destiny – to be shot with a tranquillizer gun – had children in tears...more...
‘Saru mo ki kara ochiru’ ‘THE NATURE OF MONKEY WAS IRREPRESSIBLE!’ [猿も木から落ちる]
AFP News. Feb. 20. 2008—Zoo staff spread a net to catch a fake zebra, which made a break for freedum from its cage, as it strolls in the zoo park during the annual exercise for runaway animals at Tokyo’s Ueno Zoo on February 20, 2008. Some 150 zoo staffs and policemen participated in the annual exercise. 
—Hello Kitty monkey bobble