A major conservation plan is being developed to protect the South Island's unique alpine environment from Himalayan tahrs.
The large goat-like animals were introduced to New Zealand during the early days of European settlement.
The Department of Conservation says tahrs are wrecking native alpine tussocks in their search for food, and destroying the ecosystem in the South Island's alpine regions.
But it is hoped that a renewed focus on tahrs can help reduce the population.
RNZ reporter Anan Zaki went to the rugged mountains near Mount Cook to find out more.
