A pair of screaming monkeys have been brought into a zoo to scare off thieves who might try to break in.

The zoo lost 11 marmoset monkeys earlier this year when thieves stole the tiny creatures from their cages.

It's hoped the two howler monkeys, called Greeb and Wing, will act as an alarm system as they 'scream' very loudly if they're disturbed or upset.

A man from Exmoor Zoo in Devon said he hopes the bigger monkeys - which can also bite - will scare off burglars.

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