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Biodiversity is a critical component of the natural environment and the protection of it often meant the displacement of local communities in developing countries. The Richtersveld National Park (South Africa) is unusual in that it forms part of the Richtersveld communal rangeland and is currently managed for goat and sheep farming as well as biodiversity conservation under a contractual agreement. These two objectives are not regarded as mutually compatible and have created tension between conservation management officials and pastoralists. We set out to examine the consequences of reducing herd size in a communal livestock production system in support of biodiversity conservation in a protected area. Kidding, animal offtake (sales and slaughter), mortality and herd persistence showed no clear incentives for an individual pastoralist to reduce herd size. Reducing herd size is not considered a recommended intervention for the conservation of biodiversity or livelihood improvement of pastoralists in the park. The future of the natural resources of the national park is dependent on a delicate balance between the needs of the pastoralists and the conservation of those very same resources that the pastoralists use.