Dineutus americanus

Dineutus americanus is a species of whirligig beetle, belonging to the family Gyrinidae. These beetles are commonly found in groups on the surface of quiet ponds and lakes, where they spin and whirl around. They are oval-shaped, flattened, and typically metallic bluish-black. Whirligig beetles feed on insects and other small creatures found on the water's surface. Their unique compound eyes are divided, giving the appearance of two pairs, allowing them to see both above and below the water. They are capable of flight and can also swim underwater when threatened. When disturbed, they release a milky, foul-smelling liquid, which in Dineutus americanus is said to smell like apples.1