Bee Hummingbird ( smallest living bird in the world )

The Bee Hummingbird or Zunzuncito ( Mellisuga helenae ) is a species of hummingbird that is endemic to Cuba and Isla de la Juventud. With a mass of approximately 1.6–1.9 g (0.056–0.067 oz) and a length of 5–6 cm (2.0–2.4 in), it is the smallest living bird.