Their teeth last two years and are all replaceable. Crocodiles can grow to be 20 feet long and can weigh up to 2,000 pounds. Crocodiles eat mostly fish, but have been known to catch and eat anything that wanders near enough. They swallow their prey whole, usually after drowning it, and they never chew. They have a tongue, but it doesn't help in their digestion.
Crocodiles eat rocks which stay inside the stomach and help to grind up their food.
Some scientists say that this helps keep the crocodiles from feeling hungry, or serves as extra weight while swimming or diving, to stay stable in the water. The American crocodile has an interesting way of attracting fish to them. They throw-up a very small bit of food which attracts fish making them much easier to catch. Crocodiles are cold-blooded and live in warm climates. They excavate burrows along the water's edge.