Diving beetles can be black, brown, or yellowish in color. They are found in ponds, lakes, and streams. Predaceous diving beetles are very good swimmers, using their strong hind legs to move through the water. The word "predaceous" means that this beetle attacks and eats other organisms. The diving beetle has hollow mandibles for sucking juices out of the small water animals they eat, sometimes even fish. Adult diving beetles bury themselves in mud to spend the wintertime.