The Komodo dragon is the largest and one of the best swimming lizard in the world. With one bit with a mouthful of bacteria the prey would almost allways die from infectition or bleeding to deth. We don't even have acure.
The king cobra has a bite that can kill an elephant in one strike. Snakes are one of the few animals that can smell our microscopict smells. Some can even see heet and most of them can feel vibrations. We think have por eye sight, were wrong.
This is a King Cobra gobbling up another snake, courtesy of http://www.creatures2.animallovers.co.uk/Kingcobra.html.

This is a picture of a Komodo dragon on the Island of Komodo, courtesy of www.starfish.ch.