In this picture, the Scarlet-chested sunbird sucks nectar from the flowers of a tree with its specialized bill and tongue. The sunbirds are the African counterparts to the South American hummingbirds and they can in fact sometimes hover in front of a flower just like them - but mostly they cling to branches and flowers, as in this picture. Interestingly, the moustache and the spot on the forehead actually change color depending on the light. Here the head spot looks blue, but in the previous picture it was green...