Ep 8 of 30: As more land is developed for industry and housing or converted to produce food the areas we have fenced off for nature are increasingly important. But are the worlds nature reserves essentially made into a fortress to protect the area from development able to function on their own, or do they need constant management. Are they "zoos in the wild". Monty Don hears from Hluhluwe-iMfolozi Park in South Africa, the reserve that helped replenish Southern Africa's white rhinoceros population and finds out whether size really does matter for our protected areas.
Producer: Brett Westwood