Security officials at the Commonwealth Games started deploying langur monkeys at several venues in New Delhi to keep smaller simians from causing any trouble. Langurs are a common type on monkey in south Asia, and because they are large and fierce they are often used in India to keep other monkeys in check in public places. Photo: Supplied

Security officials at the Commonwealth Games started deploying langur monkeys at several venues in New Delhi to keep smaller simians from causing any trouble. Langurs are a common type on monkey in south Asia, and because they are large and fierce they are often used in India to keep other monkeys in check in public places.

New Delhi will go into a security lockdown on Sunday for the opening of the biggest and most trouble-plagued Commonwealth Games ever.