Mechanical monsters are on the loose in a Teesdale forest - but the beasts are helping re-shape the 5,000-acre wood.

Harvesting machines will be in action at Hamsterley Forest, near Bishop Auckland and the public will get a chance to see them working. Weighing in at about 18 tonnes, these £250,000 giants have computerised "brains" linked to a hydraulic claw, capable of felling a tree, sawing off branches and cutting wood to exact measurements.

The harvesters will be in action on August 7 and 14. Places are limited. To book, £5 per person, and for details, call 01388-488312.