Holly Hagg farm in Crosspool has become the base for an unusual trekking experience with growing demand for walking tours with their small herd of alpacas. The South American domesticated animals have become a big hit as walking companions on a trekking route that takes in the Rivelin Valley and views over Stannington. Holly Hagg started offering alpaca walks for fun in 2016 but they are now a regular event with demand so high that bookings must be made in advance. Volunteers are on hand to ensure the experience is enjoyable both for the alpacas and the public. Simon Thake reports for Sheffield Live!