Lupita Nyong'o joins fight to save Africa's elephants Oscar-winning actress Lupita Nyong'o has returned home to Kenya to spearhead a new campaign to stop the record slaughter of elephants for their valuable ivory. More than 30,000 elephants are killed every year to satisfy demand for ivory in China and the Far East where it is worth more than $2,000 (1,790 euros) a kilogramme. IMAGES AND SOUNDBITES.