An enterprising bird, the drongo forages individually on the insects herded out by the
movements of other flocking birds. Insects compose 100 percent of a drongo's diet. As one
might expect, drongos that tend to associate with larger flocks of other bird species
(more than 20 birds) show increased numbers of foraging trips and harvest a larger number
of insects in a given time than those associated with smaller flocks. The drongo and the
other bird species do not compete for the same food source, so the relationship -- known
as a commensal relationship -- is a good one for the drongo. Drongos are considered
remarkable for the courage with which they will attack and dive off larger birds.