Taken 18 May 2014.
In 2011 the zoo had five, a mated pair and three offspring. Two of the kids were shipped off to other zoos in 2012(?), the mother passed away last year and the elderly patriarch passed away last month leaving the lone female. And while I'm no primatologist, if she wasn't making a distress call for hours at a time then I don't know what one is.
Anyway, the zoo very recently acquired a young male. These two were very much still in the "getting to know you" phase.