The whirligig beetle is a small aquatic insect known for its unique swimming style. These beetles belong to the family Gyrinidae and are often found in ponds, lakes, and slow-moving streams. They have a streamlined body and two pairs of legs, which they use to paddle quickly across the water's surface. Their ability to swim in circles gives them their name. Whirligig beetles are typically black or dark brown and can range from 5 to 20 millimeters in length. They are also known for their distinctive eyes, which are divided into two parts, allowing them to see both above and below the water simultaneously. This adaptation helps them spot predators and prey, such as small insects and larvae.