[i]Hystrix subcristata, Hystrix hodgsoni subcristata[/i] or [i]Hystrix brachyura subcristata[/i] depending on your taxonomic leanings (at the Beijing Zoo they were labelled as the second one).
The two guys on the right are cleaning the glass.
See here for what else I saw:
http://www.zoochat.com/247/small-review-beijing-zoo-17-sept-337116/
