Crayfish
Crayfish are found in freshwater swamps, and are referred to as 'freshwater lobsters'. In Australia, crayfish refers to a saltwater lobster, but the freshwater kind, found in the swamps of North America and Europe, is much more common.
Crayfish have eyes on short stems, which allow they to see in many directions through murky swamp waters. They also have antennae that detect movement, in case the water is too murky or muddy for them to see. They also have coloring that allows them to hide, most of the many species only turning red when cooked. The red swamp crayfish, considered an invasive species, does not have the helpful coloring. They have pincers that allow them to tear and eat food easily.
Crayfish are consumers. They are also omnivores, eating plants, animals, and decaying organisms. Large fish, snakes, muskrats, and raccoons often eat crayfish, as well as humans. There is a large crayfish population, and introduced species occasionally take over the aquatic ecosystem they are introduced to.