Over the last century, lions were actively eradicated as a threat to human safety and to livestock from most land used by people; lions from the remaining populations continue to be killed over livestock losses and safety concerns in communal areas and along the periphery of parks today. Southern African rhinos were driven to the brink of extinction a century ago, but populations were rebuilt through effective conservation activities; rhinos are now being decimated again by ruthless commercial poaching for their horns. A century ago, elephants were drastically reduced by the uncontrolled ivory trade, and displaced as a threat to crops and safety; today most of the remaining southern African populations are healthy and growing, but ruthless commercial poaching for ivory is again having an impact. Many other species are experiencing similar declines, mostly due to land conversion to agriculture and incompatible land uses.