Planting more trees 'could lead to species loss'
Victor Partridge, who looks after the Pentland Hills, said we must be careful not to destroy important habitats that have formed since deforestation in Scotland thousands of years ago.
He said many species now thrived in the open space of moors and farmland.
He said 97 insect species alone have been recorded in the Pentland Hills.
In total, more than 900 species of animals, insects and plants have been recorded in the upland area, on the outskirts of Edinburgh, which is predominantly sheep farms.
Ground nesting birds, stoats, weasels, cuckoos, long eared owls, short eared owls are all found in the Pentlands, which is about 20 miles (32 km) in length, and runs south west from Edinburgh towards Biggar and the upper Clydesdale.
These animals require open space to hunt and nest.