It's not only grass levels that the cows are helping - it's the ground too.
The cows' feet create depressions in the ground. The depressions create little tussocks that are vital for nesting birds to give cover from predators.
The Pilgrims' Way Take a journey on one of the South East's most historic routes.
Cornish tea Inside Out goes behind the scenes at Cornwall's tea plantation.
Storm chasers Join the storm chasers in search of Yorkshire's worst weather..
听听Inside Out - South West: Monday 24th February, 2003