The marvellous spatuletail (Loddigesia mirabilis) is a medium-sized hummingbird endemic to Peru. The marvellous spatuletail is unique among birds in having just four feathers in its tail. Its most remarkable feature is the male’s two long racquet-shaped outer tail feathers that cross each other and end in large violet-blue discs, or “spatules,” which he can move independently. These tail feathers are used to impress potential mates.