Zoo riddle as nine monkeys drop dead in two days

A zoo is investigating the mysterious deaths of nine monkeys in two days. Part of the Hong Kong Zoological and Botanical Gardens has been sealed off and disinfected after the animals perished following unexplained bouts of 'unusual behaviour'. The dead animals included a De Brazza's monkey, a common squirrel monkey, four white-faced sakis and three cotton-top tamarins – a species listed as critically endangered. Part of the Hong Kong Zoological and Botanical Gardens has been sealed off and disinfected after the deaths of nine monkeys A buff-cheeked gibbon swings in its cage after a De Brazza's monkey, a common squirrel monkey, four white-faced sakis and three cotton-top tamarins perished The zoo – the oldest park in the former British colony – opened fully to the public in 1871.