Amphibians, like many reptiles, are carnivores. They use many ways to trap, track and hunt their prey.
Chameleon lizards are hunting machines because their eyes can move in different directions at the same time. They track prey moving in any direction: up, down, left, or right. When a fly goes past a Chameleon, the lizard sticks out its super-long tongue and pulls the fly back into its mouth.
Salamanders are known to be another deadly hunter. They slowly and quietly approach their prey, then quickly kill it with their sharp teeth and tongue.
Snakes are well known hunters that use their huge jaws to eat their prey. They widen their jaws to consume large eggs or to swallow whole animals that are much bigger than themselves. However, since snakes do not have back teeth for crushing, they cannot chew their food.
It is well known that animals are very intelligent. Some are fast, some are sneaky and others are strong. Each animal has its unique way of catching prey in order to stay full.
[Source: 100 Things You Should Know About Reptiles and Amphibians]