The Bee Hummingbird, known for being the world's smallest bird, measures just about 2.1 to 2.4 inches in length and is native to Cuba. In contrast, the Robin, recognized globally, especially in Europe and North America, ranges from about 9 to 10 inches in length.One of the most striking differences between the Bee Hummingbird and the Robin is their size. The Bee Hummingbird weighs approximately 1....More