What Animal Am I?

Clue 1: I am a large and endangered species of reptile.

Clue 2: I am a reptile which will eat almost any type of meat including pigs and buffaloes.

Clue 3: I am a reptile which has very strong claws and sharp teeth like a shark.

Clue 4: The germs in my mouth will kill an animal, even if it escapes my jaws.

Clue 5: I am a reptile which uses my long, yellow tongue to help me smell things.

Clue 6: I am a giant type of lizard. I am the heaviest lizard in the world.