Natural nectars may contain any of the plant sugars, including sucrose, glucose, and fructose. There is no proven advantage in using, say, fructose instead of sucrose (cane sugar). Sucrose is by far the most common sugar in the flowers of plants for which Sunbirds are the primary pollenators. Water and sugar (usually sucrose) are the only constituents common to all natural nectars; most also contain traces of minerals and amino acids.
