It includes invertebrates, other reptiles (including smaller Komodo dragons), birds and their eggs, small mammals, monkeys, boars, goats, Bawean deers, horses, and water buffalos.
Although they avoid confrontation with humans, they can attack. When cornered, they react aggressively – they open their mouths, hiss, and position their tail warningly, ready to strike.
There are reports of individual cases of attacking, killing, and devouring people, however, it is presumed that such events can only be attributed to a few abnormal individuals who have lost their fear of humans and have become very aggressive.