Meliphagid

Flowers with long, tubular corollas are visited mainly by long-billed meliphagids; the latter, however, also visit flowers of other types.

The meliphagids, as their common name implies, are primarily nectar feeding or nectarivorous and were quite possibly prevented from any significant adaptive radiation on each main island by competition from the (presumably) earlier radiated Hawaiian honeycreepers.

I am not familiar with any detailed studies of the ecology of nectarivores in the brushtongued parrots, meliphagids, and certain marsupial mammals in forests of Australia and New Guinea.