Crabs mainly live in the water, but some live on land for long periods. They feed on plants as well as other insects. They can be either a scavenger or a predator. Crabs have many different features that allow them to move both on land and in the water.

On land, the generally move in a sideways motion. Although, they can move in different directions - this seems to be their personal preference. In water, their last two legs are flat so that they form nice paddles. This allows them to move efficiently through water.

There are many different types of crabs that take on different characteristics. Other types of crabs are as follows: fiddler crabs, spider crabs, ghost crabs, and the king crab. Fiddler crabs have an oversized claw that is used as a defense mechanism against predators. Spider crabs have very long legs and they like to hide in the algae under the water. Ghost crabs create homes high up in the sand, so they almost seem to disappear and can be undetectable. King crabs are the largest of the edible crabs.