Mayflies are aquatic insects belonging to the order Ephemeroptera. They are known for their short adult lifespan, which can range from a few hours to a few days. Mayflies undergo a unique life cycle, starting as eggs that hatch into nymphs, which live in water for several months to years before emerging as adults. Adult mayflies are characterized by their delicate bodies and large, membranous wings. They are often seen swarming near water bodies, where they mate and lay eggs. Mayflies play an important role in the ecosystem, serving as food for fish and other wildlife, and indicating water quality.