The controversial program has been called 'the most expensive wildlife destruction policy in British history'
The cull is an attempt to wipe out a common disease-causing bacteria
The animals appeared on television earlier this month
The film sets out to expose the truth behind 'the largest land-based slaughter' of wild animals
Campaigners don't think culling is ever humane
Now more than 75,000 people have signed a petition calling on the parks to stop the cull
A mass grey squirrel culling is in motion in a bid to save red squirrels