The water beetle is a type of insect that lives in or near water. They belong to the order Coleoptera and can be found in various habitats, including ponds, lakes, and streams. Water beetles are known for their streamlined bodies, which help them swim efficiently. They come in different sizes and colors, with some species being quite small while others can be larger than a thumb. These beetles are important for the ecosystem as they help control algae and other aquatic plants. They are also a food source for many animals, including fish and birds. Some common types of water beetles include the great diving beetle and the whirligig beetle.