What is the komodo dragon prey to?

Yes, the komodo dragon is very dangerous. It has a very dangerous, venomous bite.

For years it was believed that the danger of a Komodo dragon's bite was due not to venom, but to bacteria that live on its teeth. Recent research, however, has discovered that the bite of the Komodo dragon delivers a powerful venom which actually thins the blood, increasing blood flow and creating a state of shock in the victim. The sharp, serrated teeth of a komodo dragon are used to open a gaping wound in its prey, enabling the venom to flow easily.

The discovery of venom glands in the Komodo dragon challenges the previous assumption that fatal bites were due to the consumption of carrion (rotting things), and the resultant growth of toxic bacteria in the mouths of the lizards. Infections by these organisms would still be a serious factor in treating a bite wound. Komodo dragons do not usually attack people, preferring other game such as deer. But there are documented cases of them stalking and killing human beings.