The mystery noise keeping up zoo neighbours

Is this the source of the droning? Credit: PA

Residents living near Paignton Zoo are complaining about "a low level humming" which is coming from the giraffe enclosure.

Some locals say the noises are giving them sleepless nights and several have signed a petition calling for an independent investigation to be carried out. Others have gone one step further, as they look to bring a legal challenge against Paignton Zoo.

Peter Thorne says he's suffered nearly two and a half years of sleepless nights at his bungalow in Paignton, as a result of the low frequency hum.

Tests conducted by the local council have been unable to identify the noise - but what could be causing it?

Giraffes can produce a "droning" noise but it is thought the more logical explanation is the heating system in the giraffe enclosure.

As the stand-off between Paignton Zoo and local residents intensifies, Torbay Council has tried to identify the source of the humming: