It can take no nourishment from what it ingests.It""s working on instinct - a deep dark primordial instinct." He described how he was performing Pavlovian conditioning experiments on the zombies to ""domesticate"" them and to find a cure for the apocalyptic plague and epidemic of undead swarming throughout the country: "It can be domesticated Sarah, don""t you see? It can be conditioned to behave the way we want it to behave.Tolian Soran.Android Lt.Cmdr.Data (Brent Spiner) (with a newly-installed emotion chip that was only partially integrated into his system) and Lt.I""m not frightened of a few weird cries.Now let""s get that ivory."They forge ahead on their journey even though the uneasy natives must be whipped to proceed.They follow the tracks of an elephant herd to the edge of a wide river.There, after building wo rafts, in an exciting scene, they cross the hippo-infested river.The herd of hippos capsizes one of the rafts, causing the deaths of two of the men by crocodiles.As they are threatened by the large animals - which follow them up the other side of the river bank - hey hear the strange jungle cry twice more, and the hippos appear o back off and return to the river in obedience to the sound.Supposedly, it would be therapeutic and stop Tommy""s hallucinations if he verified that the killer Jason was actually dead and buried ("Jason belongs in Hell and I""m gonna see he gets there").