He had seen fire, but only when Ara, the lightning, had destroyed some great tree. That any creature of the jungle could produce the red-and-yellow fangs which devoured wood and left nothing but fine dust surprised Tarzan greatly, and why the black warrior had ruined his delicious repast by plunging it into the blighting heat was quite beyond him. Possibly Ara was a friend with whom the Archer was sharing his food.
But, be that as it may, Tarzan would not ruin good meat in any such foolish manner, so he gobbled down a great quantity of the raw flesh, burying the balance of the carcass beside the trail where he could find it upon his return.
Ch. 9 : Man and Man - Tarzan of the Apes (1912)