Rainbow Lorikeets feed mainly on fruit, pollen and nectar, and possess a tongue adapted especially for their particular diet. Nectar from eucalyptus is important in Australia, other important nectar sources are Pittosporum, Grevillea, Spathodea campanulata (African Tulip-tree), and sago palm. In Melanesia coconuts are very important food sources, and Rainbow Lorikeets are important pollinators . They are also frequent visitors at bird feeders placed in gardens, which supply nectar, sunflower seeds, and fruits such as apples, grapes and pears.
In many places, including campsites and suburban gardens, wild lorikeets are so tame that they can be hand-fed. The Currumbin Wildlife Sanctuary in Queensland, Australia, (where this photo was taken) is noted for its numerous lorikeets, which number in the thousands. Around 8am and 4pm each day the birds gather in a huge, noisy flock in the park's main area. Visitors are encouraged to feed them a specially prepared nectar, and the birds will happily settle on arms and heads to consume it.Semi-tame lorikeets are common daily visitors in Sydney backyards, often by the dozens.

Information quoted and excerpted from Wikipedia.