Each of the Coastal Southern California national parks maintains an active ecological restoration program addressing erosion, elimination and control of non-native animals, control and eradication of non-native invasive plants, mapping and modeling of non-native plant distributions, native seed collection, propagation, and out-planting to maintain or re-establish native plant communities and ecosystems, and/or prevention of new introductions of non-native plants and animals. Ecological restoration seeks to renew and restore degraded, damaged, or destroyed ecosystems and habitats through active human intervention and action.