Rangers in Chad 's Zakouma National Park face a serious threat from poaching operations . In recent years , park rangers have been executed in their line of work . 90 % of the park 's elephants have been slaughtered for their ivory . But , he says , `` we have to prepare ourselves . Comment:
Rangers in Chad 's Zakouma National Park face a serious threat from poaching operations . In recent years , park rangers have been executed in their line of work . 90 % of the park 's elephants have been slaughtered for their ivory . Comment: