Dragonfly
Adult damselflies have thinner, more delicate bodies than those of dragonflies. This you can see even when they are flying. When at rest, most damselflies hold their wings together above the body. Most dragonflies hold their wings horizontally. The eyes of dragonflies are larger, and touch each other. The eyes of damselflies are separated. Many damselflies live in groups close to a river. Taken together, these points are usually enough to distinguish the two groups.