The smallest hummingbird, Bee Hummingbird or Zunzuncito (Mellisuga helenae), is a species of hummingbird that is endemic to Cuba and Isla de la Juventud. Wikipedia says it grows to cm and is not only the smallest hummingbird, but its also the
Zunzuncito (Mellisuga helenae), Bee Hummingbird, th endemic to dense forests and woodland edges on the main island of Cuba. With a mass of approximately g oz) & a length of cm in), it is the smallest living bird. by Simon Colenutt.