What is the smallest bird?

The smallest bird in the world is the Bee Hummingbird (Mellisuga helenae). This tiny bird is found only in Cuba and is about the size of a bee. It weighs only about 2 grams and is 5 to 6 centimetres long. The Bee Hummingbird has a long, thin bill that it uses to suck nectar from flowers. It also eats insects and spiders.