Rare sighting of 'extinct' lion sparks hope for endangered species in Chad's national park.

A lioness has been spotted in Chad's Sena Oura National Park for the first time in almost two decades, according to the Chadian government and the Wildlife Conservation Society. Lions in West and Central Africa are considered "critically endangered," with populations declining by about 66% since the early 1990s. The region saw a period of ruthless, organized poaching more than a decade ago, but has since benefitted from a very strong commitment to conservation by the governments of both Cameroon and Chad.