another good option is to use human oil........ mas init daw ang fire kun human oils ang gi-feed .. matod pa sa mga nabasahan nako sa WW2 concentration camps... and to think , daghan daghan na man pud ang humans nag suroy suroy.. .. kun tinud-on ug harvest .. double purpose jud ang resulta.. you get oil at the same time lessens the competition for food and living space... this will be the last resort when worst comes to worst.