Crystal Glass Hummingbirds are the smallest birds in the world, with some species measuring just 2 inches long and weighing less than a penny. They have incredibly high metabolisms, requiring them to consume up to double their body weight in nectar and insects each day to sustain their energy levels. There are over 360 species of hummingbirds, with notable ones including the Ruby-throated Hummingbird, known for its vibrant throat patch and long migration. Beautiful glass tray with Ruby-throated image. Hand wash.